“As a family doctor, my goal is to deliver high-quality medical treatment through an individual, holistic approach. This includes care that encompasses both physical and psychosocial challenges. I truly enjoy getting to know my patients and helping them improve through my appreciation of medical principles.”
- William Casas, M.D.
Lynne Diamond, M.D.
Program Director - Director of Geriatrics, Hospice and Palliative Care
Dr. Diamond grew up in Southern California. She received her BA from Brandeis University and her medical degree from Loyola University Stritch School of Medicine. She did her internship at Harbor UCLA and her residency in family medicine at the University of Texas Health Science Center in San Antonio Texas. There she stayed and was in private family practice with a special interest in geriatrics for 19 years prior to returning to California in 2002. She holds ABFM Certificate of Added Qualification (CAQ) in both Geriatrics and Hospice and Palliative Care Medicine.
M. Christina Tolentino, D.O.
Associate Program Director
Dr. Tolentino is a native of Southern California. She received her Bachelor of Science degree in Biology from UC Riverside and Master in Medical Science from Drexel University. She completed medical school at Western University of Health Sciences and received her degree for Doctor of Osteopathy (DO) in 2007. After completing her residency at PVHMC in 2010, where she served as chief resident, she joined the faculty group. Dr. Tolentino became Associate Program Director in 2015 and has a special interest in women's health, wellness and medical education. She enjoys traveling to new places, bowling and spending time with her family. She lives in Fontana, CA with her husband and son.
Ryan Agena, D.O.
Faculty PhysicianDr. Agena is a native of Hawaii and is a graduate of the University of California, San Diego. He received his medical degree from Western University of Health Sciences and completed his residency at PVHMC in 2008, where he served as chief resident. He joined the faculty after graduation and practices in Chino. Dr. Agena participates in our Sports Medicine Program.
Snezana Begovic, M.D.
Director of Obstetrics and Women's Health
Dr. Begovic immigrated to the USA from Serbia where she obtained her medical degree from Belgrade University. She did a Post-Doctoral fellowship in Perinatal Biology at Loma Linda Medical School and her residency in Family Medicine followed by a Fellowship in Obstetrics at Arrowhead Regional Medical Center. She stayed as faculty until joining our residency in August, 2006. Dr.Begovic's special interests include women's health, obstetrics and medical research.
Dan Blocker, Ph.D., Medical Family Therapy
Director of Behavioral Medicine
Dr. Dan Blocker received his undergraduate degree in psychology and his master's degree in marriage and family therapy at Brigham Young University. He received his PhD in Medical Family Therapy from East Carolina University, where he also received his certificate in quantitative methods for the social and behavioral sciences. While serving as a behavioral health fellow at St. Mary's Family Medicine Residency in western Colorado, he received his certificate in advanced specialization in medical family therapy from the University of Colorado School of Medicine. In 2017, he joined the core faculty at the Pomona Valley Family Medicine Residency Program as a behavioral scientist. In this role, he oversees the behavioral health training of the residents and provides integrated primary behavioral health care at the Family Health Center. His academic interests include integrated primary behavioral healthcare, compassion fatigue/provider burnout, family and health, and quality improvement. When not working, he is running, at the beach, or spending time with his amazing wife.
Allan D. Cabral, M.D.
Faculty Physician, Medical Director of Residency Practice
Dr. Cabral is a native of the Philippines. He received his medical degree from the University of the Philippines in Manila, completed his family medicine residency at PVHMC in 2012, where he served as chief resident for 2 years. He joined the faculty in 2013 and is actively involved in residency committees and projects, and teaches practice management. Dr. Cabral is developing his practice at the Family Health Center.
William Casas, M.D.
Dr. Casas was born and raised in Colombia. He attended medical school at the Juan N. Corpas School of Medicine in Bogotá and completed his residency at Pomona Valley Hospital Medical Center where he served as a chief resident. He joined the faculty after graduation in 2016. Dr. Casas was drawn to family medicine by its emphasis on disease prevention and healthy living. He strongly believes that individual lifestyle decisions are a core component of the community’s overall well-being. In addition to providing personalized treatment for his patients’ conditions, Dr. Casas educates them about proper health decisions. He is fluent in both English and Spanish and has a special interest in teaching hospital medicine. On his time off he enjoys playing soccer, racquetball, going to the beach, dancing salsa and spending time with his family.
Douglas Chiriboga, M.D.
Faculty Physician - Director of Underserved Medicine ProgramDr. Chiriboga is from East LA, is a graduate of Occidental College and received his medical degree from UCLA Geffen School of Medicine. He did his internship at USC Presbyterian Hospital and his family medicine residency at White Memorial Medical Center. He joined the faculty in 1997 and has an active practice at the FHC. Dr. Chiriboga's special interests include Geriatrics and care for the underserved.
Michael D. Deanda, M.D.
Dr. Deanda provides comprehensive healthcare to patients of all ages, as well as occupational medicine for injured workers. He also delivers compassionate hospice and palliative care to patients in need of end-of-life care.
Dr. Deanda’s patients value his open and friendly communication style, and his commitment to delivering highly effective and efficient care. He takes pride in helping his patients prevent chronic health conditions, and is dedicated to caring for the whole patient. He frequently gives presentations on health conditions such as chronic fatigue.
When he is not practicing medicine, Dr. Deanda spends time with his wife, son and daughter. He enjoys running, and volunteers at Our Lady of Assumption Catholic Church in Claremont.
Lester Holstein, M.D.
Faculty PhysicianDr. Holstein grew up in Southern California. He received his BA from Point Loma Nazarene College and his medical degree from Loma Linda School of Medicine. He completed his family medicine residency at Glendale Adventist Medical Center. Dr. Holstein has a large practice in Claremont and has been an active leader of PVHMC since 1996.
Jeffrey Ijadi, M.D., CAQ
Faculty Physician - Director of Sports Medicine
Born and raised in Los Angeles, California, Dr. Jeff Ijadi is board certified in Family and Sports Medicine. Dr. Ijadi is a member of American College of Sports Medicine (ACSM) and American Medical Society of Sports Medicine (ASMSSM). Dr. Ijadi attended UCLA where he received his Bachelors of Science in Psycho-Biology and Minor in Education. Following UCLA, he attended AUC School of Medicine and subsequently completed his residency training and board certification in family medicine at Pomona Valley Hospital Medical Center. He completed his fellowship training in Sports Medicine through the Evergreen Sports Medicine Fellowship Program.
Keith Kusunis, M.D.
Faculty PhysicianDr. Kusunis is originally from Joliet, Illinois. He is a graduate of the University of Illinois, Champaign-Urbana and received his medical degree from the University Of Illinois College Of Medicine. He completed his residency at Resurrection Hospital in Chicago, where he was chief resident. He has served as chief of the medical staff at PVHMC and has a thriving practice at the FHC. He joined the faculty in 1998. Dr. Kusunis has a Certificate of Added Qualifications in Geriatrics and a special interest in contraception, women's health and office procedures.
Hanh Larson, D.O.
Dr. Larson completed her undergraduate education at UCLA and medical degree at Western University. She then went on to do residency and fellowship in Family Medicine and Sports Medicine at Kaiser Permanente Fontana. She is Board Certified in Family Medicine and has a Certificate of Added Qualification in Sports Medicine. She enjoys the full spectrum of Family Medicine, but also loves to practice Sports Medicine in order to get athletes of all types get back on their feet. On her free time, she is an avid ultra-marathoner and triathlete.
Danica Lomeli, M.D.
Faculty Physician - Assistant Director of Curricular Design and Program Development
Dr. Danica Lomeli grew up in Rancho Cucamonga before attending Stanford University for an undergraduate degree in biology. She stayed on at Stanford for a master's degree in religious studies followed by medical school. After her time at Stanford, Dr. Lomeli returned to Southern California to train at the UCLA-Santa Monica Family Medicine Residency Program, where she solidified her passion for full-spectrum patient care and medical education. In 2016, she joined the core faculty at the Pomona Valley Family Medicine Residency Program, where she provides primary care services to patients at the Family Health Center as well as obstetrical services and hospital-based care. Her academic interests include the medical humanities, physician psychology, curriculum design, and educational innovation.
Darlene McPherson, Ph.D, FNP
Director of Operations
Dr. McPherson was born and raised in Southern California. She received her MS in Nursing and her Family Nurse Practitioner certificate from the California State University, Dominguez Hills. She received her doctorate in nursing from the University of San Diego. Her research interest is in childhood obesity in Mexican-American preschoolers. Dr. McPherson has a primary care practice in the Family Health Center and has had an administrative role in the residency program since 1997.
James Meyers, D.O.
Dr. Meyers was born in Anaheim and was raised in Chino, CA. He graduated from University of California, Irvine, and received his medical degree from Western University of Health Sciences. He completed his residency at PVHMC in 2015, where he served as chief resident. Dr. Meyers enjoys full spectrum family medicine care, including sports medicine, geriatrics, and in-patient medicine. Teaching residents is one of his main goals. On his days off, you can find him at the beach or doing something active. He enjoy sports and cheering on his fantasy football/baseball teams.
Gisella Olivares, D.O.
Dr. Olivares was born and raised in Southern California. She attended UCLA and received a BS in psychobiology. She also received a Masters in Biology from Cal State University, Dominguez Hills.
She attended medical school at Western University of Health Sciences and lived in the Inland Empire since. She remained in the Pomona area and completed her family medicine residency at PVHMC in 2005. After being in private practice for 9 years, She decided to come back to teach residents at the Family Health Center. Dr. Olivares is a proud Latina physician with a deep commitment in serving Latino patients in the Inland Empire.
Erik Olsen, M.D.
Director of IT Support for the Faculty Medical Group
Dr. Olsen is a California native who completed his undergraduate degree at UC Riverside and his medical degree at the Medical College of Ohio. He has a MS in Biochemistry from Medical College of Ohio. He completed his residency in family medicine at PVHMC, where he was chief resident and joined the faculty after graduation in 2007. Dr. Olsen has a special interest in OB and Sports Medicine.
Sula Safar, D.O.
Faculty PhysicianDr. Safar is a native of Southern California and received her undergraduate degree from Cal State Fullerton and her medical degree from Western University. After completing her residency at PVHMC in 2011, she joined the faculty group. Dr. Safar has a special interest in Women's Health.
Katherine Schlaerth, M.D.
Dr. Schlaerth is a native of Pennsylvania. She graduated from Manhattan College and received her medical degree from the State University of New York, Buffalo. Dr. Schlaerth completed her pediatrics residency at LA Children's Hospital and an Infectious disease fellowship at LAC-USC Medical Center. She is board certified in pediatrics, pediatric infectious diseases, family medicine and has a Certificate Added Qualifications in Geriatrics. Dr. Schlaerth was an associate professor at Loma Linda and is an associate professor emeritus at USC. She has a special interest in research and has published in addiction medicine, child development and other areas.
Duane Styles, M.D.
Dr. Styles is a native of Canada, graduated from the University of Alberta and completed his residency in family medicine at Calgary General Hospital. As a member of the medical staff of PVHMC since 1977, he has held numerous medical appointments including chief of staff. Dr. Styles is active in the community as team doctor for a local high school's athletics department and he has Certificate Added Qualifications in Sports Medicine.
M. Leticia Valadez, M.D.
Dr. Valadez grew up in Fullerton, California, received her BS from Stanford University, and her medical degree from UC Davis. She joined the faculty group in 2002 after completing her residency at PVHMC. Dr. Valadez helped develop the Women's Track and is dedicated to the underserved and community teaching.
Libia Wohlert, M.D.
Dr Wohlert emigrated from Venezuela where she graduated from Universidad Centro-Occidental Lissandro Alvarado. She joined the medical group following her graduation from PVHMC family medicine program in 2008. Dr. Wohlert has a special interest in OB and women's health.