Josh Barnhart, M.S., C.G.C.
Genetic Counselor

Josh received his Bachelor's Degree from UC Davis and his Master’s Degree in Genetic Counseling from Virginia Commonwealth University. He has been with the John Muir Health Genetic Counseling Program since 2020. His goal as a genetic counselor is to help patients learn about the complexities of  hereditary cancer risk and provide them with support throughout their hereditary cancer journey.

Shellie Campos, M.S.N., R.N., F.N.P.-B.C., A.G.N.-B.C.
Nurse Practitioner

Shellie received her Master’s Degree in Nursing and Family Nurse Practitioner Training from Vanderbilt University. She is also certified as an Advanced Genetics Nurse and a Family Nurse Practitioner. Shellie has been with the John Muir Health Cancer Institute since 2010, where her role is to provide Nurse Navigator and Nurse Practitioner services to patients in the High-Risk Cancer Program and several John Muir Health special programs. 

Sharon Chan, M.S., C.G.C., M.P.H.
Genetic Counselor

Sharon received her Master’s Degree in Genetic Counseling from California State University at Northridge.  She has been with John Muir Health Breast Health Services since 2018.

Sojin Durrant, M.S., L.C.G.C.
Genetic Counselor

Jin received her Master’s Degree in Genetic Counseling from California State University Stanislaus. She joined the John Muir Health Genetic Counseling Program in 2020. As a genetic counselor, her goal is to empower patients with a clear understanding of complex genetic and medical information and guide them in their decision-making processes.

Sheila Marquez, R.N., M.S.N., C.B.C.N.
Nurse Navigator

Sheila received her Master’s Degree in Nursing from Western Govenors University. She is also certified as a Clinical Research Coordinator and Breast Care Nurse. Sheila has been with John Muir Health since 1998. She contributed ten years each as a Medical-Surgical Nurse and Clinical Research Nurse, and currently serves as the Nurse Navigator for Breast Health Services.

Denise Munoz, BS, RDMS, RVT
Supervisor, Outpatient Imaging

Denise received her Bachelors of Science degree from San Jose State University.  She has been with John Muir since 2018.  Her imaging specialty is ultrasound, and she is registered as a Diagnostic Sonographer in multiple specialties (RDMS), including vascular (RVT). She has worked her entire career in both acute care settings and dedicated breast imaging centers.  She currently serves as the Outpatient Imaging Supervisor. 

Linda Parkinson
Supervisor, Outpatient Imaging

Dina Rumble, R.T. (R)(M), B.S.
Manager, Outpatient Imaging

Dina received her Bachelor’s Degree from Saint Mary’s College of California.  She has been with John Muir since 1996.  Her roles at John Muir have included: Radiologic Technologist (including mammography) at the Walnut Creek campus, PACS analyst, Outpatient Imaging Supervisor, and she currently serves as the Outpatient Imaging Manager. 

Bernadette Tawasha, M.A.
Office Assistant

Bernadette is the Office Assistant for the John Muir Health Breast Health Center. Her role is to register patients, collect information upon arrival, and direct patients to their specific service area (Genetic Counseling, High Risk Breast Clinic or Clinical Research). She also obtains insurance authorizations for procedures, schedules appointments and answers questions about the services we offer.

Vivian Wing, MD
Director of Medical Imaging

Dr. Wing received her Bachelor's Degree from Northwestern University, and medical degree from Northwestern University Feinberg School of Medicine. She completed her residency and fellowship at the University of California at San Diego. Dr. Wing is Board Certified in Diagnostic Radiology and has been in practice for more than 20 years.