Our medical staff is committed to providing high-quality care to the community — and focused on your overall health. Learn more about who we are and what we do. Better health together begins with a connection and learning more about each other.
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Amy Quarre, PA-C
Amy is a Certified Physician Assistant with nearly 15 years of experience in the medical field.
Beverly Mayer, ANP
Beverly Mayer, an Adult Nurse Practitioner, has more than 30 years of experience as an RN and Nurse Practitioner.
Bridgett Morris, LVN
Bridgett brings more than 10 years of experience in health care, including working in the Emergency Room at Sierra Nevada Memorial Hospital and in private practice.
Christina Lasich, MD
In addition to her responsibilities as Chief Medical Officer, Dr. Christina Lasich oversees the health center’s expanded substance abuse treatment services, especially for residents addicted to opioids such as prescription pain medications and heroin – a growing concern in the region and nationally.
David Narita, MD
Dr. David Narita, who provides care to adults and children, has extensive experience in primary care medicine in California and internationally. Dr. Narita is Board Certified in Family Medicine.
Donna Tully, PA
Donna Tully, a Physician Assistant, works in the Grass Valley health center in Urgent Care and Family Medicine.
Doris Royer
Doris has more than 15 years of experience counseling adults and adolescents with substance abuse disorders (SUD).
Jennifer Hays, DMD
Dr. Jennifer Hays comes to Western Sierra from ACC Health in Albuquerque, NM, where she provided comprehensive mobile dental services for military personnel. Dr. Hays was awarded a Doctorate in Dental Medicine from the University of Pittsburgh in 2010 and a Bachelor of Science from UC Davis.
Jenny Rivard-Voboril, RN
Jenny brings almost a decade of health care experience to Western Sierra.
Juan Alberto Chavez, DDS
Dr. J. Alberto Chavez graduated from dental school at the National University of Mexico. He took the dental boards at Loma Linda University, California in 1996. Prior to relocating to Grass Valley, he practiced general dentistry in the Los Angeles area for 17 years.
Justin Pfaffinger, DDS
Dr. “Justin” received his Doctorate of Dental Surgery from the UCLA School of Dentistry in 2009, graduating with highest clinical honors.
Kelly Miner-Gann, LCSW
Kelly is a Licensed Clinical Social Worker who has worked in the Behavioral Health field for more than 10 years.
Kirsten George, PA
Kirsten George handles the health care needs of newborns to seniors. She joined Western Sierra in 2015.
Kulvinder Boparai, MD
Dr. Kulvinder Boparai has 25 years of extensive community clinic and internal medicine experience.
Lora Lee Grutkowski, FNP
Lora Lee is a Family Nurse Practitioner and medical and emergency care provider at the Downieville site clinic.
Michael Curtis, MD
Michael E. Curtis, MD received his advanced training from the University of Pittsburg Medical School in 1983 and participated in the Residency Training Pediatrician program at the Naval Hospital San Diego.
Monte Penner, MD
Dr. Penner did his medical training at Loma Linda University in Southern California and has been in general practice (seeing patients of all ages) for almost 30 years.
Natalia Orozco, FNP
Natalia Orozco, a Family Nurse Practitioner, has more than five years of health care experience.
Polly Conley, PNP
Polly joins Western Sierra from 14 years of private practice in Roseville. She has a Masters in Pediatrics from University of California, San Francisco and she received her BSN from Brigham Young University.
Sarah Boyett, LCSW
Sarah is a Licensed Clinical Social worker who has over 8 years of experience working in the Community Mental Health field. She specializes in working …
Sarah Woerner, MD
“Dr. Sarah” grew up in Nevada City, has been a practicing pediatrician since 1982 and speaks fluent Spanish.
Seson Kahn, FNP
Seson Kahn, a Family Nurse Practitioner, has more than 10 years of experience in health care.
Susan Shapiro, MD
Dr. Susan E. Shapiro – who has practiced medicine for more than four decades, including 20 years in Auburn – has joined Western Sierra Medical Clinic as a primary care provider.
Tetsuya Shirasuka, DDS
Natalia Orozco, a Family Nurse Practitioner, has more than five years of health care experience.
Trish Hartman
Patricia “Trish” Hartman provides substance abuse counseling at Western Sierra’s Placer County health centers in Auburn and Kings Beach (Tahoe).
Zarlasht Fakiri, DO
Dr. Zarlasht (Zari) Fakiri is Board Certified in Internal Medicine, specializing in adult medicine.