Crossover Health @ North First

(408) 495-5850

145 Nicholson Lane
San Jose, CA 95134

Hours: Mon-Fri 8am to 5pm

Practice walk-through

Your team at North First.

When you start down the path to health and wellness, it’s great to know your team will be with you all the way providing expert knowledge, timely motivation, and even a little inspiration. We share a passionate belief in the power of relationships and look forward to meeting you!

Akbar Zikria, DO

Primary Care

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Akbar is a board certified family physician dedicated to helping his patient’s achieve the highest level of satisfaction with their health. He had done his residency at a community clinic in San Jose (CA) working with an underserved population and continued sharpening his clinical skills while working with a similar population for a few years after residency. The intricacies of insurance plans and coverages were at times difficult to decipher, however, Akbar welcomed the challenge and was driven in figuring out how to steer through these obstacles. This is a testament to his hard work and perseverance in making sure his patients receive the services they deserve.


Akbar has always enjoyed the diversity in the south bay area and has embraced it having found many lessons to be learned from the various cultures. Part of the reason behind this is due to his interest in learning languages and having grown up in an eastern culture himself; he speaks Farsi and Spanish in addition to English. He also finds having insight into a patient’s culture will ultimately help lead to clinical decision making that is most appropriate for that particular patient. Having trained at an osteopathic program for medical school, the holistic philosophy of medicine and strong understanding of the musculoskeletal system is engrained in him.


Asiya Khan, MD

Primary Care

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Asiya is a board-certified family physician who comes to Crossover with over 8 years of patient care experience in Northern California. Asiya completed residency in family medicine. Asiya was selected for the “Mark Stinson Fellowship in Global Health and Leadership” in 2010. The fellowship was offered in collaboration with Contra Costa Health Services and UC Berkeley. Asiya also completed a Masters in Public Health from UC Berkeley in 2012.


Asiya is an avid advocate of providing integrated health services and has worked enthusiastically with the multi-ethnic communities of San Joaquin, Contra Costa Counties and the South Bay area. She has a special interest in the behavioral, dermatological and musculoskeletal aspects of healthcare. She believes that doctors touch the lives of people every single day. Asiya’s long-term vision is to treat the whole family as a unit and utilize her education and experience to address their needs effectively with a multidisciplinary approach. Nature has always been a great source of inspiration for Asiya. In her spare time, Asiya loves to bike, read books and travel the world with her husband and 3 beautiful kids.


Leslie Luff, BSN, RN

Practice Manager

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Leslie is an experienced Registered Nurse with over 20 years of health care delivery experience. She began her career at Stanford Hospital where she worked as a staff nurse, clinical nurse specialist, physician liaison, and PACU nurse. She later gained experience in several specialities including cardiology, orthopedic spine, gastroenterology, internal medicine, and ambulatory surgery. Leslie brings her love of serving and caring for others to her role as the practice manager, responsible for the day-to-day clinical management of the health center. She will help ensure your visit to the health center combines the highest quality of care with an exceptional experience.


Leslie is a California girl who was born in Malibu and raised in Menlo Park where she still resides today. She finds great satisfaction in working with people to help them reach their full potential. She is an active mom who enjoys baking, pilates, tennis, and is a huge football and baseball fan! She can often be found helping with her daughter’s crew team or trying to keep up with her son on a dirt bike.



Jessica Felty, RN

Registered Nurse

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Jessica is an energetic worker and has a love for primary care. She has spent most of her nursing career working in a fast-paced pediatric practice and as an elementary school nurse. She also worked at a nationally top ranked hospital in St, Louis, MO as a Neuroscience PCU nurse. Jessica has almost 10 years of nursing experience and strives to form a relationship with every one of her patients and their families. She believes that forming an open, honest, and trusting relationship between her and her patients is the most crucial step in establishing a good base for excellent healthcare.


Jessica is from a small town in Southern Illinois and relocated to the Bay Area earlier this year for her husband’s job. She enjoys exploring everything California has to offer and plans on trying to get to all of the National Parks in California and surrounding states. She loves adventure and exploring anything and everything she can find. Jessica values quality time with her family and their hilarious dog, Diesel. She enjoys being able to expose her son to the diversity and the many different cultures that are found in the Bay Area.


Andrea Cerezo

Lead Host

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Andrea is ambitious and driven to put her best work forward as she enjoys working with people and is passionate about the health and wellness field. She graduated as a Dean’s Scholar from San Jose State University with a Bachelor of Science in Kinesiology. Andrea has over 7 years of experience in the health care field from working in a Nursing home and at a Physical Therapy clinic. She believes and values the importance of creating a positive patient experience for every member as they walk through the door.


Outside of work, Andrea enjoys spending her time outdoors and venturing out to find new places to eat. She loves to explore different hiking trails, enjoys going out for a run, and loves weekend trips to the beach.


Christine Letrong


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Christine is a quirky and compassionate individual who loves connecting with people and is passionate about health and wellness.


Christine was born in Oklahoma but raised in the Bay Area. She attended San Jose State University where she received her Bachelor’s Degree in Health Services Administration. Christine began her career in health care working at a behavioral health clinic as a Clinical Assistant while she was in college. Once she received her degree, she moved on to work as a Referral Specialist for a large children’s hospital in Palo Alto. Christine also worked in the tech industry for a short while, only to realize that healthcare is where she truly belonged.


Outside of work, Christine spends a lot of time with her family and takes advantage of the weekends by going on short trips. Christine loves all dogs but loves her Maltese-Dachshund pup Phoebe, the most! Christine enjoys staying active by going to the gym and rewarding herself for being active by eating good food.



Jason Yuag, DPT

Physical Therapist

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Jason received his Doctorate in Physical Therapy from Samuel Merritt University in 2009. Since then he has been primarily focused on treating patients in an outpatient setting where he has treated a variety of orthopedic injuries; however, it is in sports-related injuries where Jason’s passion lies having treated athletes from the high school to the professional level.


Jason understands that every person is unique which is why he takes his time with each patient to customize a treatment plan to develop an individualized plan of care with specific goals achievable by each patient. Jason utilizes a very hands-on approach with his patients as well as using functional exercises and patient education to yield the best outcomes.


Jason continues his educational pursuit to ensure his patients receives the most up-to-date evidence based evaluation and treatments to provide the best care he can offer. He is also a Certified Ergonomic Assessment Specialist 1 (CEAS 1).


In his personal time, Jason likes to maintain his health and fitness by playing sports, spending time outdoors, weight lifting and training. He also loves spending time with his family and friends as much as possible while rooting for the Warriors and Niners.


Ryan Deubel, DC


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Ryan is a California board-certified chiropractor who is constantly motivated to expand his knowledge base in both personal endeavors and chiropractically. He has obtained, utilized and progressively developed a skill-set that includes wide-ranging adjusting techniques, Active Release Therapy (ART), Graston Technique, flexion-distraction, taping and rehabilitation in both sporting and non-sporting environments. Throughout his career he has utilized this knowledge base and skill-set across multiple west coast offices, a personally owned practice in Michigan, as well as multiple athletic events, including the Ironman World Championship in Hawai’i. With these skills he strives to provide the highest quality chiropractic care for prevention of injuries, quick and effective rehabilitation of existing injuries, and management of further disorders.


Ryan was born and raised in Lansing, Michigan as the youngest of four children. He participated in multiple sports throughout his youth, including high school and college wrestling. Undergraduate studies were completed at Grand Valley State University where he received a Bachelor’s degree in Health Science with honors. He then went on to complete his chiropractic studies at Palmer College of Chiropractic West where he received a Doctorate of Chiropractic with honors, as well as multiple awards that included Intern of the Year. When not in-office with patients, he enjoys exercise and outdoor adventures that include running, cycling, hiking and camping. He is also very motivated by creative endeavors in music, food and coffee.



Sahar Ghasemi, LAC


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Sahar is a Licensed Acupuncturist with a passion for integrating Eastern Medicine into the modern healthcare system. She earned her Master’s of Science in Traditional Chinese Medicine from Five Branches University in San Jose and her Bachelor’s in Global Environment, Health and Natural Resources from the University of California, Davis. In addition to her studies Sahar completed an intensive hospital internship at China Medical University in Taiwan where she had the valuable opportunity to observe the integration of Traditional Chinese Medicine in a Western hospital setting. 


Sahar specializes in a broad range of conditions including pain, athletic injuries, stress, depression, and women’s health. She strives to create individualized treatment plans focusing on bringing balance to the body, mind, and spirit in order to address the root cause of her patients health concerns. She strongly believes in educating her patients about self care and providing them with tools to continue their healing outside of the clinic. 


Born and raised in California, Sahar enjoys the beautiful weather, nature, and diversity here. She values quality time with her family and friends. Outside the clinic she loves dancing, traveling the world, taking Persian poetry classes, soccer, and exploring the outdoors. 



Jennifer Gordon

Massage Therapist

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Born and raised in the south bay area Jennifer received her BA from Humboldt State University before deciding massage was the path she wanted to follow. Jennifer is a Nationally certified massage therapist and has been practicing massage for 20 years. In those years she has over 1000 hours of training as well as being trained as a Pilates instructor in the Polestar method.


Jennifer designs each session based on client goals and needs. Whether you completed your first Spartan race, need to de stress or just want to have the kinks worked out, Jennifer can provide a massage to help you reach your goals. Jennifer utilizes many techniques including deep tissue, cranial sacral, myofascial release and cupping. Jennifer believes that how we take care of ourselves today influences how we age.


Outside of work she spends time in the gym, playing with her three dogs and cooking meals from her garden.


strength coach

Brendan Rearick, CFSU

Strength Coach

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Brendon’s personal mission is to spread the positive by-products of coaching and movement by using strength and conditioning as his platform. As a member of the Crossover care team, he is on a mission to make physical activity the new “most commonly prescribed drug.”


With a degree in Kinesiology from the University of Massachusetts Amherst, Brendon got his start at Mike Boyle Strength and Conditioning (MBSC) in Woburn, MA. The growth-focused environment at MBSC motivated Brendon in a way he had never experienced. Over a few short years he progressed to become the Program Director and earned his massage therapy license. Soon thereafter, he started an education company with four co-workers – Certified Functional Strength Coach. In just three years, CFSC has certified over 3,000 trainers in over 20 countries.


Now a California resident, Brendon travels and coaches often for Certified Functional Strength Coach, and has recently become an active speaker at the Perform Better summit conferences. With an inexhaustible drive to learn more, practice his craft, and be the best version of himself, Brendon dedicates his free time to continuing education, dancing with his 3-year old daughter, reading, writing, and enjoying in the outdoors.



Allison Tanner

Strength Coach

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Allison developed a passion for strength and conditioning when she started training to play Division 1 field hockey at Quinnipiac University located in Hamden, CT. While she attended school she was diagnosed with a brain infection that changed her career path and life plan. She began to realize that health should be a priority and that taking care of your body can sometimes be the best form of medicine.


She earned her degree in Health Sciences from Quinnipiac University in May of 2017 and completed several internships before earning her CSCS in 2018. She also has an FMS certification.


Allison believes that exercise is much more than just getting strong or getting fit. She believes that exercise can help improve health status, movement patterns, prolong life expectancy, as well as build confidence.


Outside of the gym, Allison loves to continue to educate herself as much as possible by reading and spending time with other fitness professionals. She also enjoys going to the beach and traveling.



Sonya Bruner, PsyD

Clinical Psychologist

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Sonya obtained her bachelors in psychology from St John Fisher in Rochester, NY, and later her M.S. and Doctorate in Psychology at Antioch University New England, in Keene, New Hampshire. Sonya completed her pre-doctoral internship year at Riverbend Community Health in Concord, NH, and post-doctoral residency at Genesis Behavioral Health in Laconia, NH, with a specialization in adolescents and families. Following her post-doctoral training, she entered private practice and expanded her clinical focus to include work with adults with a variety of presenting problems, including anxiety, depression, and trauma, in addition to relational and family issues. Sonya has a strong interest and background in applying principles of dialectical and cognitive-behavioral therapy in treatment, including teaching mindfulness strategies. In addition, she has an ongoing interest in working with clients on issues related to trauma survival and recovery, and phase of life stress and resilient identity transformation.


Sonya was born and raised on the East Coast, but relocated to California in 2016. She enjoys spending time exercising, doing outdoor activities, reading, and spending time with friends and family.



Valentina Del Olmo, MA, LCSW

Behavioral Health

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Valentina is an experienced clinician who specializes in helping clients to overcome the feeling of not being good enough. She is certified in the work of Brené Brown, PhD, LMSW on shame and the importance of vulnerability in creating a meaningful life and relationships. She uses the TEAM Cognitive Behavioral Therapy (CBT) approach to provide effective treatment for depression, anxiety, relationship problems and habit/addiction struggles. Valentina pursues continued development of her clinical skills through participation in weekly consultation groups and TEAM CBT trainings facilitated by Dr. David Burns, author of Feeling Good, The Feeling Good Handbook and When Panic Attacks. She worked with many highly educated, successful individuals who have found that professional accomplishments did not result in the personal fulfillment and happiness they expected.


Valentina was born and raised in Los Angeles, California. She is proud of her mixed cultural heritage and identifies as a woman of color. She arrived in the Bay Area to attend Stanford University as an undergraduate in the early days of the Silicon Valley and has lived in the area off and on ever since. She is an avid college football fan with Stanford Football season tickets. However, Valentina also refers to herself as “a recovering Stanford student” to acknowledge her daily effort to let go of perfectionism and live an authentic, wholehearted life. She enjoys reading historical fiction and, on vacations, you will usually find her browsing antique stores, fabric stores and bookstores.



Brittany Murray, MPH

Health Coach

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Heather seeks to improve the health of the community by coaching others how to adopt easy, sustainable, and optimal lifestyle habits. She loves food in all of its many iterations, starting from seeds and soil, to what ends on our plates. As a college student-athlete, she learned firsthand the importance of nutrition for cognitive and physical performance, and through her years of international travel, Heather came to embrace food as the thread that connects the world. Heather joins our team with a deep love of learning, utmost respect for different cultures, and a nose for good food.


Heather was born in San Francisco and spent her childhood on California’s central coast. She studied at Cal Poly University in San Luis Obispo, earned her Master’s at San Jose State University, and has spent the past decade at UCSF and Stanford Health Care as a dietitian. Heather’s ideal day would be spent riding bikes with her husband and kids to the local farmers market, trail running with her dog, and having family and friends over for dinner and drinks.



Anastasia Alvarez

Marketing Specialist

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Anastasia has a gift for relationship building which she has honed in a variety of clinical settings over her working experience. In her role as host, Anastasia is the first person to greet you and help you feel welcome as you begin the care experience. She also helps with any patient service issues, including coordinate appropriate follow up. She was fortunate to work and gain experience while in various medical clinics ranging from a surgery office to a physical therapy clinic. Anastasia is a San Francisco native and a graduate of St. Mary’s College of California.


Anastasia loves San Francisco and continues to enjoy exploring and finding hidden gems the the city has to offer. She has a goal to visit every stadium in the NFL and MLB. She has a passion for sports, including both the Giants and 49ers. She previously served as a 49ers Fan ambassador where she provided game day customer service for 5 seasons. When not working she enjoys traveling and hanging with friends and family.

Melissa Hann

Referral Coordinator

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Melissa is a high-energy individual who thrives best in social settings. Melissa is more than a morning person, she is an all day person with a happy and helpful attitude. She enjoys working in environments that challenge her and allow her to collaborate with different personalities. Opportunities to express creativity and explore new ideas are important to her. She is self-motivated and tackles new projects with enthusiasm. Her extensive experience in fast-paced customer service makes her a great fit for the Crossover team and their clients.


Melissa was born and raised in the San Francisco Bay Area. She received her Bachelor of Science Degree in Kinesiology from San Jose State University. During that time, her experiences include internships and volunteer work that gave her the opportunity to work with Special Olympic athletes and various age groups. Melissa also enjoys cooking and is constructing her own book of recipes. Bikram yoga is her favorite method of relaxation and physical activity. Most of all, she loves spending leisure time outdoors with her dog Izze.


Paul Estioko

Referral Coordinator

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Paul is an amiable and adventurous individual with the personal goal to make at least one person smile a day. Meeting new people, delving into new experiences and places, and attempting to find comfort during uncomfortable situations are a few things he finds joy in. Ever since Paul was old enough to work, he began learning and fostering invaluable skills from working in varied industries – education, restaurant, fine arts, and rehabilitation to name a few.


Paul was born in the Philippines and immigrated to the United States in 1997 and is the youngest of six children. He attended college at San Jose State University where he was Cum Laude and received his Bachelor’s of Science in Health Science and also minored in Kinesiology. Outside of the clinic, He is also a “triple threat.” Paul is a professional performer who sings, acts, and dances for theatre, film, and private events around the Bay Area and abroad. Paul also is a Hula/Tahitian dancer, loves comic books, and believes stickers are too much commitment.

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