Our team is your team.

On the path to health and wellness, it’s great to know your team will be with you all the way with expert knowledge and inspiration.

Marilyn Ralph_

Marilyn Ralph, MD, dipABLM

Primary Care Physician

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Marilyn is a board-certified Internal and Lifestyle Medicine Physician. Marilyn’s passion is to apply Lifestyle Medicine both personally and professionally, regularly cooking her own plant-based meals while motivating her patients to engage in evidence-based lifestyle change to prevent, treat, and reverse chronic disease.


Born and raised in Florida, Marilyn graduated from The University of Florida College of Medicine. She then decided to venture west to complete her residency at Kaiser Permanente in Santa Clara, California. In her free time, she and her husband enjoy the outdoors: mountain biking, hiking, playing golf, and tennis.


– BA, Spanish and Chemistry, Wake Forest University

– MD, University of Florida

Lilian Lam

Lilian Lam, RN

RN Practice Manager

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Lilian loves working in healthcare because it is both rewarding and fulfilling. But what keeps her (and what she is in love with) is that there are always changes keeping her engaged and on her toes. Being a nurse gives her a variety of different specialties and niches, so she’s been able to find what’s right for her personality type, and loves that if she wants to change her specialty one day, nursing is a field that gives her the flexibility to do just that. She’s happy to be in an industry full of selfless individuals, one that allows her to serve the community as well as develop professionally.


Lilian earned a BS in Health Science from California State University, East Bay, and an AS in Nursing from City College of San Francisco. Prior to her role as Practice Lead, she worked as the Nurse Manager/Office Manager at a pediatric primary care office in SF, where she developed a passion for working with and encouraging new parents. She also worked in a Med-Surg unit at a small community hospital in her hometown of Delano, California, which is where she got experience working on a code-blue team. Lilian also learned the value of having culturally competent providers, nurses, and support staff while she was in that role. All of her experiences have shaped her as a nurse, and helped her consider each unique path that the people she’s helping might be on—including patients, family members, or the staff she serves.


Outside of work, Lilian enjoys reading, hiking, cooking, and baking.


Melinda Wong, RN

Registered Nurse

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Melinda is a compassionate Registered Nurse who has been practicing the art of nursing for over 32 years. She is detailed and highly motivated to provide competent patient care. She enjoys getting to know her patients and developing a strong professional rapport with them. She has worked in both hospital and outpatient settings in the areas of orthopedics, neurology, apheresis, and oncology. Melinda believes in the power of preventive medicine to improve patient outcomes. Born in Dallas, Melinda’s family moved to a small copper mining town in Arizona at the age of four. From a very young age she knew she either wanted to be a teacher or a nurse, and when she discovered that nursing entails a lot of patient education, she felt that could satisfy both of her ambitions. In her spare time she enjoys tennis, travel, reading, and spending time with her husband, three children, and grandson.


– ADN, Pima College


What makes me unique: In my younger years I competed in several bodybuilding competitions and continue to enjoy weight training and exercise in general. I have traveled to over 10 countries and enjoy immersing myself in the culture of each country.


Why do I practice healthcare: Since childhood, I have had a keen interest in healthcare. I enjoy learning new things, patient relationships, and the ever-evolving nature of medicine. I was looking for a new perspective on healthcare administration, and was impressed with Crossover’s vast variety of services provided under one roof. I enjoy the collaborative efforts and camaraderie of our teams.

Lauren DeSilva

Lauren DeSilva, PsyD

Mental Health Therapist

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Lauren looks forward to helping others every day. The power of awareness and change keeps her excited about what she does, and she believes that everyone already has what they need inside to maximize their potential. Lauren approaches each patient with the mindset that health and wellbeing improve when prioritized, and it starts with taking that first step.


Lauren has worked in community mental health clinics, hospitals, substance abuse and crisis centers, and private practice. She uses evidence-based modalities in therapy, such as Cognitive Behavioral Therapy, along with Dialectical Behavioral Therapy, and Solution-Focused Brief Therapy.


Lauren was born in Houston, TX and raised in Orange County, CA. She enjoys spending time with her Beagle puppy and going for walks and hikes, as well as spending time with family and friends and hosting them at her home. She loves visiting the beach and traveling to new places, even if that’s just getting in the car and taking a road trip with her puppy.


-BA, Psychology (minor in American History), University of California, Davis

-MA, Clinical Psychology, Azusa Pacific University

-PsyD, Clinical Psychology, Azusa Pacific University


What makes me unique: My spontaneity keeps life fun, and I am always searching for what I can look forward to next. I stay connected to friends by frequently throwing out fun ideas and making plans. I also have the ability to stay emotionally attuned to the needs of others and respond accordingly. Whether someone is feeling sad or stressed, I will sense it and be there for those around me.


Why do I practice healthcare: I am drawn to helping and serving others. Since a young age, I have embodied servant leadership and wanted to uplift people. I enjoy providing therapy because I can have a direct impact and role in my patients’ wellbeing, and I can provide a safe space that many times cannot be found elsewhere. Crossover’s integrated approach allows me to continue practicing holistically, and I love working within a multidisciplinary team so that I can incorporate other disciplines and perspectives into the care I deliver.

Olivia Chu

Olivia Chu, DC


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As a chiropractor, Olivia enjoys discovering different ways of movement to treat and improve the lives of her patients. In her practice, Olivia enjoys using movement assessments and patient education to help others get better faster.


Olivia is a California native who doesn’t mind paying the sunshine tax to be close to the ocean and the mountains. She usually spends her free time with her husband and dog on walks around the neighborhood lake, discovering new recipes, and spending time with friends and family.


-BS, Biological Science, University of the Pacific

-Doctorate of Chiropractic, Palmer College of Chiropractic

-Recipient, BiofreEze Scholarship


What makes me unique: My caring nature.


Why do I practice healthcare: I enjoy sharing my knowledge with others to enhance their life and minimize pain and discomfort.


Ben Manuel, DC


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Ben is a California native, born and raised in San Francisco. He received his Bachelor’s degree from the University of California at Berkeley and his Doctorate in Chiropractic from Palmer College of Chiropractic West in San Jose, CA. He draws on his 14 years of experience in running a multidisciplinary private practice when it comes to treating patients. He is very excited to join Crossover’s integrated healthcare team at Visa. He believes that a good doctor needs to listen and educate each and every patient in order to develop a specific course of treatment that will optimize their health. When he is not taking care of patients, you will find him playing tennis, fishing, volunteering time to Palo Alto High School football or spending his weekends with family in San Francisco or Santa Cruz.


Laurie Wallace, PT, MPT, ATC

Physical Therapist

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Laurie has focused her 20+ year career as a Physical Therapist and Certified Athletic Trainer on providing exceptional patient care and personalized results. She loves having a personal connection with members and believes in focusing treatment on the underlying problem (rather than symptoms) for the best long-term result. She strives to empower and educate members with the tools to make confident decisions and to become the best version of themselves.


Laurie incorporates a variety of techniques in Eastern and Western philosophies, and is committed to continuous professional development and learning about innovative treatments. She uses micropoint stimulation, acupressure, guasha, and kinesiology taping, as well as tapping, breathing, and meditation techniques to calm the mind and body. She has worked with multiple organizations including professional and collegiate sports teams and athletes, both on and off the field. Some of these include NFL Europe (Barcelona Dragons), Arena Football League, Championship Place Kicking and Punting (with Hall of Fame nominee, coach Doug Blevins), McGirt Boxing (with International Boxing Hall of Fame coach Buddy McGirt), and athletes from the NBA, MLB, professional soccer, and D-II co-ed sports.


Laurie and her husband enjoy exploring San Francisco, hiking, attending wine festivals, trying new restaurants, and traveling the globe. She is an active member of Alpha Phi International Fraternity at large, and was nationally ranked when she retired from bodybuilding competitions. When she’s not treating patients, Laurie enjoys practicing yoga, studying Chinese medicine techniques and homeopathy, and working out.


-AA, Pre-Physical Therapy, Indian River State College

-BS, Sports Medicine (minor in Biology), Barry University

-BS, Biology (minor in Physical Therapy), Barry University

-Recipient, Sears Directors’ Cup Postgraduate Scholarship, Barry University

-Recipient, Sports Medicine Outstanding Graduate of the Year, Barry University

-Recipient, Sister Jeanne O’Laughlin Community Service Award, Barry University

-MPT, Nova Southeastern University

-Certified, Athletic Training

-Certified, Yoga Instructor (200 hour)

-Certified, Homeopathy and Myofascial Decompression

-Functional Movability Specialist


What makes me unique: I love jigsaw puzzles and completed my first 1000 piece puzzle at age five. Professionally, what makes me unique is that I create relationships first. I strive to build trust and provide an empathetic ear for members. At Crossover, I’m empowered to truly surround members with the care and support they need.


Why do I practice healthcare: I am passionate about education and helping others learn more about their bodies. I use open communication and teamwork to empower every member to be a part of their own success.


Joe Davis, LAc


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Joseph is a seasoned Traditional Chinese Medicine practitioner and Acupuncturist with over a decade of experience. He completed his BA in Interdisciplinary Studies at the University of Berkeley. He later obtained his Master of Science in Traditional Chinese Medicine as well as achieving his Acupuncturist License. In addition to his initial training, he has completed advanced training in acupuncture, herbal medicine, and nutrition. One of his passions is making the ancient and time-tested methodologies of Chinese medicine approachable and relevant for modern people. In this capacity, he serves as a professor at the Academy of Chinese Culture and Health Sciences in Oakland. He has also always understood the importance of movement for maintaining physical and mental health, and is currently a Tai Ji Quan and Qi Gong instructor at a multidisciplinary center in Oakland. After successfully establishing his own community-based acupuncture practice, Joseph has joined our team at Visa to bring the treasures of Chinese medicine to an employer-based practice, and be part of an integrated care team.


Joseph enjoys learning about different cultures, and has traveled extensively. He enjoys cooking meals with fresh produce from his family’s small garden and the local farmers’ markets. In his spare time he can be found hiking the trails of the Bay Area, paddling on northern California’s many rivers, chasing around his two young boys, and studying eastern philosophy and culture.

Julie Baumhofer

Julie Baumhofer, LAc


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Julie believes in a prevention-first, integrated model of medicine and provides a personalized approach that blends Eastern thinking with Western living. She considers a patient’s openness to making the prescribed lifestyle and diet changes that often accompany treatment to be the most important aspect of the working relationship.


In the 14 years she has been practicing acupuncture and Traditional Chinese Medicine, Julie has honed her skills in women’s health, herbal medicine, and cupping.


Originally from sunny Florida, Julie loves the great outdoors. She can be found most days with her teacup Chihuahua Daisy, hiking in and around the Bay Area.


-BS, Zoology, University of Florida

-MS, Traditional Chinese Medicine, American College of Traditional Chinese Medicine


What makes me unique: I was very lucky to travel extensively when I was younger. Seeing people from all walks of life living so differently from myself (and each other) had a profound impact on me. I am open to looking at things in new ways and always willing to listen.


Why do I practice healthcare: I work in healthcare because I genuinely enjoy helping others, and I wanted a career that would allow me to continue learning over the course of my lifetime. I have been lucky enough to find both these qualities through a career in Chinese medicine.

Christina Becker

Christina Becker, MPH, RDN, NBC-HWC

Health Coach

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Christina’s mission is to empower people to achieve optimal health and wellbeing by guiding their wellness journeys with an integrative, wholesome, caring, and holistic approach. Believing in a “Heal, don’t fix” approach, she aims to reconnect each client with their own innate healing capacity, while providing them with the tools to make permanent lifestyle changes.


Christina has over 17 years of experience working in the healthcare industry in a number of disciplines including dietetics, non-profit community health, corporate wellness, and coaching. Her practice is influenced by science-based integrative and functional nutrition/medicine, coaching methodology, traditional healing systems such as Ayurveda and Traditional Chinese Medicine, Yoga philosophy, mindfulness, and the body positive movement.


German by birth, world-citizen by choice, Christina was living in New York when she started her search for an environment that aligns with her philosophy for healthy living. She eventually chose Half Moon Bay, California to be her new home. In her free time you can find her meditating, in the yoga studio, on the beach, hiking in the mountains, practicing Brazilian dance, or traveling to places both near and far. A true foodie, she loves to experiment in the kitchen and share her latest food discoveries with friends.


-BA, Dance Teaching, Theater School of Amsterdam, The Netherlands

-BS, Nutrition and Food Sciences, Hunter College

-Masters of Public Health Nutrition, Hunter College

-Certified, Dietitian-Nutritionist, New York State

-Certified, Integrative Health and Lifestyle Program for HealthCare Professionals (IHelP), Arizona * * * * * Center for Integrative Medicine

-Certified Intuitive Eating Counselor

-Certified Hatha Yoga Teacher

-National Board Certified Health and Wellness Coach

-Certified Lifestyle Coach, AADE (PreventT2 Lifestyle Change Program)


Why do I practice healthcare: I initially became a Registered Dietitian to help dancers and athletes establish a healthy relationship with food and their bodies to prevent eating disorders. This mission expanded to a general desire to help people heal and establish balanced and nurturing self-care routines. Witnessing the resilience, commitment, and transformations of my clients continues to inspire me, my work, and my personal growth.


Kaiser Permanente


Eugene Kim, DO

Primary Care

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Eugene was born in New Jersey but grew up in the Bay Area in Moraga, CA. After graduating from UC Davis with a B.S. in Physiology, he decided to stay in California and attended Touro University College of Osteopathic Medicine in Vallejo, CA. Hw completed his residency in Modesto, CA, am Board Certified in Family Medicine and joined Kaiser Permanente in 2005. He is excited to be part of a group of physicians leading a family medicine centered approac to patient care.


He believe in providing personalized patient care, fully respecting the unique medical and social backgrounds that each person possesses. He is also a strong advocate of preventive medicine, encouraging my patients to take responsibility of their own health by leading healthier lifestyles through proper nutrition, regular exercise and stress management. He realized that a trip to the doctor can be a nerve-racking experience; he makes it a priority to make his patients feel comfortable and at ease during the visit.


His medical interests include preventive medicine, internal medicine, sports medicine, and pediatrics. In addition to English, he also speaks Spanish and some Korean. When Eugene is not practicing medicine, he enjoys hiking, surfing, and playing golf.


Barbara Yap, MD

Primary Care

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Barbara obtained her medical degree at the University of the East, Philippines in 1995 and finished her residency training in family practice at New York Medical College-St. Joseph’s Medical Center, Yonkers New York in 2005. She is board certified by the American Board of Family Medicine since 2005. Prior to coming to Kaiser Permanente, she worked in a family practice group in Marysville, WA for two years.


At a young age, she was fortunate to be inspired by family members and friends who were role models as doctors in their field. Aside from that, her parents always encouraged her to go on mission trips with them when she was a teenager. These experiences further fueled her desire to serve and give back to the community.


On a personal note, Barbara was born and raised in the Philippines. She is of Chinese-Filipino heritage. She speaks fluent Tagalog, and understands a little bit of Chinese and Spanish.


Sima Sura, MD

Primary Care

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Sima has always been in the Bay Area but did her undergraduate studies at UCLA, and completed her Medical Education from Flinders University of South Australia School of Medicine in Adelaide. She then came back to California to complete my residency at Loma Linda University Medical Center. She is Board Certified in Family Medicine and fulfilling her childhood dream of providing children and adults the tools they need to live a happy and healthy life.


She is particularly interested in pediatrics & adolescent medicine, adult medicine, preventive medicine, and Health education. She enjoys performing minor procedures and skin health. Her philosophy of medicine involves partnering with her patients to come up with good strategies for healthy living and with parents.


When Sima is not caring for her patients, she loves visiting new countries, traveling, reading, watching foreign movies, dancing, and socializing with family and friends.


Sharon Ou, MD

Primary Care

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Sharon attended Tufts University School of Medicine and enjoyed the academic challenges and rich culture in Boston, MA. She then completed her residency at the University of California, Irvine, Medical Center, and am Board Certified in Internal Medicine. She have always enjoyed the cultural diversity and beautiful weather in California.


She joined the Southern California Permanente Medical Group after her training. When her family relocated to Northern California in 2000, she joined the Permanente Medical Group here in northern California without any hesitation and have enjoyed the preventive health and teamwork approach that Kaiser has to offer to its members.


She is interested in preventive health and like to work together with her patients to achieve good health. She encourages all her patients to be proactive about healthy lifestyle.

She also speak Mandarin and Taiwanese.


When Sharon is not at work, she enjoys spending time with my family. They love traveling, music, and getting together with their friends.


Bryant Hom, DO

Primary Care

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Bryant was born and raised in San Francisco and have always appreciated the diversity of the Bay Area. He completed his medical education at Kansas City University of Medicine and Bioscience, followed by residency at Kaiser Foundation Hospital in San Francisco, and am Board Certified in Internal Medicine. Deciding where he would practice medicine was an easy choice, as was joining the The Permanente Medical Group.


Bryant recognize that internal medicine is indeed very challenging and demands great dedication, but also know that the rewards come with practicing medicine far surpass what it requires. He finds practicing primary care medicine is fulfilling in that it provides the opportunity to forge long-term relationships with his patients, seeing them through their illnesses and taking part in improving their overall health, including preventive care. He is committed to providing his patients with the best quality of care and dedicated to fostering a relationship of respect and mutual trust.


Outside of work, Bryant enjoy cooking, running, hiking, and spending quality time with his family.


Christopher Lau, MD

Primary Care

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As an internist, Christopher’s primary goal is to work with his patients to help them make educated decisions about their healthcare, keeping in mind their background and values.


He values the collaborative nature of medicine and believes that the best medical plans are created with the patients and not just for them. No two patients are identical and nor should their plans of care be either.


His interests in medicine are varied. He have a keen interest in sports related injuries and treatments along with nutrition and general wellness. These interest coincide with my personal interests of running (he is a half marathoner, working his way to a full) and kettle bell training.


He accepted his position with Kaiser Permanente in the fall of 2015 after having recently moved from NYC, where he had spent the last 13 years, to be closer to his family.


Christopher grew up just outside of Washington DC and received my BS degree in Biochemistry from the University of Virginia and continued with my medical education at Virginia Commonwealth University.


He eventually moved to NYC in 2002 for training purposes at Mount Sinai where he continued on as associate professor of medicine training medical students. He is board certified in Internal Medicine.


Ginny To, LVN

Licensed Vocational Nurse

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Ginny has been devoted to providing compassionate nursing care since 2013.  She has worked in a wide array of clinical settings including neurosurgery, breast health, and pediatrics.  Her experience has helped her learn to effectively communicate and understand patient’s needs.  She is very passionate about her job and strives to give a pleasant patient experience every time. Currently, Ginny is taking classes to obtain a degree in Registered Nursing.  During her free time, Ginny enjoys spending time with her cat Luna, photography, and traveling.


Sue-Hyan Lin, LVN

Licensed Vocational Nurse

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Sue is a Licensed Vocational Nurse with a diverse background in healthcare, ranging from family medicine to acute mental health. Before joining Kaiser Permanente, she took care of adolescents and adults in an inpatient mental health and substance abuse setting. Her experience working with people of various ages and health conditions gives her the ability to communicate and work effectively. Sue was born in Burma and relocated with her family to the Bay Area. Her goal is to become a Registered Nurse and continue to grow in the medical field. During her free time, she enjoys spending time with her loved ones, exploring new places and sampling different types of food.


Anne-Margareta Cruz (Marj), LVN

Licensed Vocational Nurse

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Marj is a highly-motivated nurse professional. She is devoted to providing the utmost level of care to her patients. She began her career in healthcare in 2009 after graduating with a Bachelor’s degree in Nursing. Since that time, she accumulated nearly eight years of clinical nursing experience and education in various areas of nursing – inpatient, outpatient, and academic setting. She is passionate about fitness, food, and travel. She believes that finding balance in life is important. Her true desire is to promote a positive healing experience for her patients – body, mind, and spirit.


Craig-Ryan Q. Torda, LVN

Licensed Vocational Nurse

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Craig has been providing compassionate and holistic care for patients since 2014. His range of experience includes psychiatric care, pediatrics, and adult medicine. He takes pride in paying attention to detail and closing the communication loop to ensure that his patients’ needs are addressed. During his free time, he loves spending quality time with his family. Some of Craig’s hobbies include cooking, fishing, and hiking.

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Our website(s) uses cookies to distinguish you from other users of our website. This helps us to provide you with an exceptional experience when you browse our website(s) and also allows us to improve our site and serve personalized advertisements regarding services that may be of interest to you. By continuing to use the site, you are agreeing to our use of cookies.