Steven Harrison, MD

Program Director

Dr. Harrison joined our faculty in 1991, and transitioned from part-time community faculty to full-time residency staff in 2008. He attended Undergraduate School at UC San Diego and went to Medical School at Southwestern Medical School in Dallas, Texas. He did his Residency at the University of Maryland in Baltimore. From there he started a private practice in King City (Southern Monterey County), where he did the full range of family practice included obstetrics and nursing home care for many years. His community involvement has included membership on the Boards of the Monterey County Medical Society and the Central Coast Alliance for Health. He has served as Chief of Staff at Mee Memorial Hospital in King City and has been the Medical Director at Eden Valley Care Center since 1995. He loves to teach and has a wealth of knowledge and wisdom to share with our residents. Outside of Natividad he enjoys skiing, fishing and other activities with his family and does significant volunteer work in the local community.

Marc Tunzi, MD

Assistant Program Director

Dr. Tunzi grew up in the small town of Spreckels, about 5 miles from Salinas. After graduating from Santa Clara University in 1980 and the University of California, San Diego, School of Medicine in 1984, he completed a Family Medicine Residency at the UCSF-Fresno program in 1987. Together with his family physician wife, Dr. Danielle Acton, Dr. Tunzi spent two years at the Indian Health Service Hospital in Crow Agency, Montana and four years at a community/migrant health center practice in Twin Falls, Idaho, before returning to Salinas to join the faculty at NMC in 1993. He was our Program Director from 2000 to 2005. Dr. Tunzi’s special medical interests are medical ethics and behavioral issues, though he really sees himself as a true family physician generalist more than anything else. Dr. Tunzi is in the middle of a Master’s Program in Bioethics that is his passion. Dr. Tunzi's family includes two daughters and one son, all in college. He tries to amuse himself, the residents, and the rest of the staff by speaking in various accents or by whistling his way around the hospital.

Gary R. Gray, DO


Dr. Gray attended the University of Osteopathic Medicine and Health Sciences in Des Moines, IA. He completed his Family Medicine residency training at Womack Army Medical Center in Fort Bragg, NC. After completing his military commitment he was in private practice and later served as a residency faculty member in Colorado. Prior to joining the Natividad faculty, Dr. Gray was the Predoctoral Director in the Dept. of Family Medicine at Georgetown University. Dr. Gray has been on the faculty since 2001, and was our program director from 2005-2009. He enjoys the breadth of Family Medicine as practiced at Natividad. Outside of medicine he enjoys spending time with his family and sailing in nearby Monterey Bay.

Abril Arias, MD

Dr. Arias specializes in Family Medicine and received her medical degree from Autonomous University of Baja California School of Medicine in Tijuana, Baja California, Mexico. After medical school she became part of the University of California, Los Angles International Medical Graduate Program. She completed a Family Medicine Residency at University of California, San Diego, serving as Chief Resident of the program in 2012. During her residency, Dr. Arias was named Outstanding Intern in Labor and Delivery by the Obstetrics Department. She was also a member of the UCSD Perinatal Practices Committee that sets policy for patient care in the labor, delivery and post-partum departments. Dr. Arias was initially attracted to Salinas for the Obstetrical Fellowship. She completed her year in training here at Natividad Medical Center and loved the community and the patients so much that she decided to stay. Her special interests include: Obstetrics, Underserved Medicine and Teaching. Dr. Arias is fluent in English and Spanish. 

Matthew A Calzetta, MD

Dr. Calzetta was born in Salinas and grew-up in Monterey County. He attended University of California: Santa Cruz, then medical school at University of Southern California. He completed an Internal Medicine and Pediatrics ("MedPeds") residency at Tulane Medical Center in New Orleans, then returned to Salinas and signed on to work and teach at Natividad Medical Center. It's great to be back home!

David J. Goldstein, MD

Dr. David J. Goldstein joins the faculty at Natividad Medical Center after a three-year stint as Assistant Director of the Waukesha Family Medicine Residency in Waukesha, Wisconsin. He was also Assistant Professor at the Department of Family and Community Medicine at the Medical College of Wisconsin in Milwaukee. Dr. Goldstein, who served in the U.S. Navy for 10 years, received his bachelor's degree in 1997 from Rutgers College, New Brunswick, New Jersey and his M.D. in 2001 from Robert Wood Johnson Medical School of Rutgers University in Piscataway, New Jersey. Shortly after graduating, he served a one-year internship at the Naval Medical Center Portsmouth in Portsmouth, Virginia. During his service in the Navy, Dr. Goldstein served as General Medical Officer at the U.S. Navy Recruit Training Command, Great Lakes, Illinois; two years as Flight Surgeon at the U.S. Navy Carrier Air Wing Eleven Detachment, Oak Harbor, Washington; and two years as Flight Surgeon at the U.S. Navy Training Air Wing Six in Pensacola, Florida. After leaving the Navy in 2007, he served a three-year residency at the Columbia-St. Mary's Family Medicine Residency in Milwaukee. Just prior to his position at the Waukesha Family Medicine Residency, he served two years as Adult Hospitalist at Presbyterian Hospital in Albuquerque, New Mexico.
In addition to being assistant professor at Medical College of Wisconsin, he also was a Clinical Assistant Professor at Family and Community Medicine at the University of New Mexico in Albuquerque. He is a member of the American Academy of Family Physicians, Society of Hospital Medicine and the Society of Teachers of Family Medicine, and is on several boards and committees, including as chairman of the Procedure Competency Task Force of the Council of Academic Family Medicine. During his time in the Navy he was awarded the Navy/Marine Corps Commendation Medal and the Navy/Marine Corps Achievement Medal.

Jessica Taylor Goldstein, MD

Dr. Jessica Goldstein, who specializes in family medicine and obstetrics, joined the Natividad Medical Center staff after three years as Assistant Professor of Family Medicine at Medical College of Wisconsin Family Medicine Residency in Waukesha, Wisconsin.
Like her husband, Dr. David J. Goldstein, she served in the U.S. Navy, and was honorably discharged in July 2009. During her time in the Navy she served as Naval Flight Surgeon at Camp Pendleton in California for two years and as Naval Flight Surgeon for two more in Milton, Florida. After graduating with a bachelor's degree from the University of California Davis, Dr. Goldstein received her M.D. in 2001 from the Northwestern University Feinberg School of Medicine in Chicago, Illinois. Shortly after graduating, she served an internship at the Naval Hospital Camp Pendleton and trained as a flight surgeon at the Naval Aerospace Medical Institute in Pensacola, Florida. She also served a three-year residency at Columbia St. Mary's Family Medicine Residency in Milwaukee, Wisconsin and a two-year fellowship at the University of New Mexico Maternal Child and Reproductive Health Fellowship in Albuquerque, New Mexico. In addition to her bachelor's and doctorate degrees, she also received a Public Health Certificate from the University of New Mexico in Albuquerque. Dr. Goldstein was honored in "Top Docs of Albuquerque for Family Practice" by Albuquerque Magazine in both 2011 and 2012. She has been awarded the Navy/Marine Corps Achievement Medal, Global War On Terrorism Expeditionary and Service Medals, Presidential and Naval Unit Citation for OIF, National Defense Medal, and ribbons for Fleet Marine Force, Sea Service Deployment. She was also deployed in 2003 for five months to Kuwait and Iraq in support of Operation Iraqi Freedom. Her family medicine interests include maternal, child, reproductive and preventative healthcare, and teaching and working with the underserved. In her leisure time she loves to run and has completed 11 marathons, including first place for military women ages 20-29 at the San Diego Marathon in 2002. She is also a proud mother of three daughters.

Bonnie Hall, MD

Caring and compassionate, Dr. Bonnie Hall is an obstetrics fellowship trained family physician who is dedicated to excellent care for her patients. She believes in treating each patient as family. She values the time and concerns of her patients and will try to thoroughly care for her patients. She speaks Mandarin Chinese fluently and basic Spanish. Dr. Hall has 3 children and a loving husband and enjoys gardening. She sees patients at Laurel Vista Clinic and Laurel Family Practice and works at Labor and Delivery at Natividad Medical Center one day a week.

Wendell Harry, MD

Originally from Texas, Dr. Harry is a graduate of the University of Texas Southwestern Medical School in Dallas. We were fortunate that he did his Family Medicine Residency here at Natividad, and joined the faculty upon graduation. He has worked in several local community health clinics and health-related non-profits.  He is an HIV clinician at the NIDO Clinic here at Natividad, and recently established the first High Resolution Anoscopy (HRA) procedure clinic in the Tri-County area.  His professional interests include family-centered perinatal care, HIV/AIDs and Skilled Nursing Facility care. His personal time is dominated by organic gardening, tree farming, cat herding,  and other bucolic diversions on his “homestead,” environmental conservation, cycling and karaoke.

Edward Macias, EdD

Dr. Macias is the Director of Behavioral Science, and Director of Training for doctoral level psychology interns. Originally from LA, he graduated from UC Riverside in psych, then from UCLA with an MSW degree. He went to Harvard for a Doctoral degree in counseling and consulting psychology, where he also trained as a neuropsychologist. He has held clinical and teaching positions at Lowell Community Health Center, North Shore Children’s Hospital and the Murray Research center, all in Massachusetts. Dr. Macias is also in private practice and enjoys yoga, hiking, racquetball, photography, magic, and racing at Laguna Seca. You can ask him for a ride in his race car, but you have to bring your own helmet!

Walter Mills, MD

Dr. Mills says “I love being a Family Physician, but love teaching family medicine even more!” He joined the Residency in 2014 after being part of the UCSF Department of Family and Community Medicine at Santa Rosa since 1986. He directs the Geriatrics and In Patient Family Medicine Rotations, and Faculty Development. Prior to joining Natividad, as a Program Director, he developed a new Kaiser Permanente residency in Santa Rosa and new medical student programs for UCSF and Touro Medical Schools. As Deputy Director for the Sutter Santa Rosa program, he founded an Integrative Medicine Fellowship, PCMH Ambulatory Care Curriculum, and Performance Improvement Primer/Curriculum. He serves on the CAFP Board of Directors, is Vice Chair of the CAFP Statewide Medical Education Committee, as well as the Resident and Medical Student Affairs Committee.  He was Co-Director of the UCSF Northern California Faculty Development Fellowship. Dr Mills attended Notre Dame, UCSD Medical School, and UCLA-Santa Monica FM Residency, earning a Master’s of Medical Management from the American College of Physician Executive's University of Southern California program in July 2002; Fellow of ACPE (FACPE) in 2005; President, CEO, and Medical Director in several medical groups; CMO for a nine site FQHC; CAQ in Geriatrics; American Board of Integrative Holistic Medicine being a certified meditation instructor and founder Northern California Center for Well-Being; AAFP Residency Solutions Business Consultant.  Dr Mills has spoken nationally on residency innovation, finding balance and joy in a medical life, and the Patient Centered Medical Home. 

Minerva Perez-Lopez, M.D.

Dr. Perez-Lopez, a Salinas native who graduated from Alisal High School, is distinguished with honors, scholarships, and academic recognitions. She received her medical degree from Brown University School of Medicine in Providence, Rhode Island. She completed her residency at the Family Medicine Residency Program at Natividad Medical Center, where she was named Chief Resident in 2005 and was awarded the department's Hannon-Lauderdale Memorial Award for Outstanding Performance in Residency. She then completed an Obstetrical Fellowship at Santa Clara Valley Medical Center in San Jose, California. Dr. Perez-Lopez says her educational background offered outstanding opportunities, but her goal was always to return to the community she knows and loves to be a family physician. Dr. Perez-Lopez is fluent in English and Spanish. Dr. Perez-Lopez is also the vice chair of the board of directors of the Natividad Medical Foundation, which is dedicated to philanthropically supporting Natividad Medical Center in its mission to provide health care access to all patients regardless of their ability to pay.

Eric Sanford, MD

Dr. Sanford is the Co-Director of Community Medicine. He attended medical school at USCF, and residency at UCSF-Fresno. Interested in the underserved, he has worked at the Berkeley free clinic and in Micronesia with the Peace Corps. He is now a primary care physician in the Seaside Family Health Center and has done research on the lead epidemic in that community. He is a physician member for the local MediCal HMO advisory group. He enjoys surfing, astronomy, backpacking, traveling and cruising in his ’62 Corvette.

Debi Siljander, MD

Prior to joining Natividad, Dr. Siljander served as medical director of Together Health Network (THN), a statewide network of hospitals and healthcare providers in Michigan. She has been a sports medicine and family practice provider for more than 10 years, working at the Monterey Physicians Medical Group and MedQuan Sports Medicine, PC. Dr. Siljander is passionate about healthcare transformation initiatives that optimize patient care and experience.

John Silva, MD

Dr. Silva joined Natividad this year. He has lived and practiced in Salinas since July 1987, when he was recruited to the area by former Natividad residency graduate Antonio Velasco, MD, with whom he practiced for a decade. Dr. Silva received a Physician Incentive Loan award from the State to start and maintain a practice in the medically underserved East Salinas “barrio” of Alisal. John is most grateful for the lessons learned caring for that largely monolingual Spanish-speaking population for over 20 years. Originally from Providence, RI, Dr. Silva graduated from Brown University Medical School, then completed FP residency at UCSF’s Community Hospital of Sonoma County in Santa Rosa in 1986. Prior to coming to Natividad, Dr. Silva worked at Clinica de Salud del Valle de Salinas, where he served as medical director from 2005-2010, helping the clinical and administrative teams maintain JCAHO accreditation three times. It was through those experiences that he learned the important points that documentable and consistent quality of medical care for all patients was safe and satisfying, and found his passion for population-based approaches to delivery of healthcare. Dr. Silva hopes to help spread awareness of Wagner’s Chronic (Planned) Care Model to a new generation of physicians, through his work at NMC.

Sally Tirado, LCSW

As Co-Director of Community Medicine, Ms. Tirado has created an integrated Community Medicine curriculum. She holds masters degrees in Social Work, Nutrition and Education. Before joining the faculty, Sally served as a medical social worker at Natividad and as a consultant on cross- cultural health. Her background includes community organizing, labor management work with the United Farm Workers, health education, and ESL teacher. As a private practice psychotherapist, she focuses on domestic violence, women’s issues and mind/body therapies. Sally is also a recognized screenwriter and has won International film festival awards. Her other special interests are dance, cross-country skiing and hiking.

Jeannine Wahl, DO

Dr. Wahl moved to Salinas with her husband and has fallen in love with the community and surroundings of Monterey county ever since. She joined our faculty after graduating from our residency at Natividad in 2012. She attended Undergraduate School at UC Berkeley and went to Medical School at Western University of Health Sciences in Pomona, California. During medical school she recieved a dual degree with a masters in Health Sciences Education and that has fueled her passion for assisting residents find their way to becoming excellent family physicians. As a fellowship trained DO, she is interested in starting the first osteopathic manipulation clinic at Natividad. She loves to teach and has interest in helping the residents daily lives be fufilling, exciting and well-organized. Outside of Natividad she enjoys cooking from the abundance of vegetables she and her husband recieve through their CSA, as well as hiking and jogging with their two dogs and exploring the many nearby wilderness areas on backpacking trips.

Christina Zaro

Originally from Petaluma, CA, I attended college at UC Davis, majoring in human development, then medical school at Medical College of Pennsylvania, now known as Drexel University in Philadelphia. I took an experimental problem-based teaching tract, learning in small group case reviews instead of lectures. After graduating, I went on to complete my residency training at the Ventura County Medical Center, a program much like Natividad. My husband and I then spent almost a year travelling and volunteering in Central America. I first studied tropical medicine in Peru and used some of this knowledge in small hospitals in Nicaragua, Honduras, and Chiapas, Mexico. On return in 2002, I landed in King City, CA, where I had worked in a small rural hospital and community clinic until leaving recently to become part of the medical staff at Natividad. We have two boys, ages 8 and 11. I like to mountain bike with my family, cook, do yoga and dance.



Natividad Medical Center • 1441 Constitution Blvd. • Salinas, CA 93906 • (831) 755-4111