OUR TEAM
Our providers share a commitment to outstanding and compassionate patient care. PRMG has managed the emergency department at Ukiah Valley Medical Center for over 25 years and continues to do so in collaboration with Adventist Health.
Georgina Calderon, MD/MPH
Dr. Calderon completed medical school at the University of California San Francisco and residency in Emergency Medicine at Alameda County Medical Center- Highland Hospital. She earned her Masters Degree in Public Health from Johns Hopkins Bloomberg School of Public Health and her undergraduate BA in Chemistry and Political Science at Williams College.
Prior to joining PRMG, she served as Country Director for sidHARTe- part of the Columbia University Mailman School of Public Health- in Rwanda, where her efforts focused on health system strengthening by providing technical expertise to the Rwandan Ministry of Health to develop robust emergency care systems. Dr. Calderon has worked in a number of international settings, including Syria, Liberia, Honduras, Micronesia and the Palestinian Territories and continues to consult for the WHO on emergency medicine delivery systems in low-resource environments.
As faculty of the AHUV Family Medicine Residency program, she leads the emergency medicine and point-of-care ultrasound curriculums and is the Director of Emergency Ultrasound Services for the Emergency Department. She currently serves as the Chief Medical Officer for PRMG.
She serves on the Board of Directors for the Sonoma-Mendocino-Lake County Medical Association and Corazon-Healdsburg. Dr. Calderon is Board Certified in Emergency Medicine.
Drew Colfax, MD
Dr. Colfax moved to Mendocino County with his family in 1973. He left to attend Harvard College, where he graduated with magna cum laude and, subsequently, received a Rockefeller fellowship which took him to North and West Africa for 18 months. Upon his return, he attended the University of Michigan, where he received a MA in Anthropology, and Juris doctorate. A multiyear stint as an attorney in Alabama representing people under a sentence of death eventually led him back to medical school.
Kelsey Coolahan, MD
Kelsey Coolahan completed her medical education at Cooper Medical School of Rowan University in South Jersey followed by Emergency Medicine Residency at St. Joseph’s University Medical Center in North Jersey. In between, she pursued an MBA at Cornell SC Johnson Graduate School of Management in order to empower herself and others to create positive change in the rapidly evolving landscape of healthcare. She is passionate about patient advocacy and education.
Emily Coyle, MD
Dr. Emily Coyle is an emergency medicine physician. Originally from New Jersey, she earned her Bachelor of Arts in Biochemistry from the University of Florida and completed her medical degree at the University of Central Florida College of Medicine. She went on to complete her residency training in Emergency Medicine at Henry Ford Hospital in Detroit, followed by a fellowship in Emergency Ultrasound at the University of California, Davis. Dr. Coyle’s professional interests include point-of-care ultrasound, medical education, and quality improvement initiatives. In her free time, she enjoys exploring the outdoors, traveling, attending live music events, and spending time with her dog.
Sam Dercon, MD
Dr. Dercon was born in The Netherlands, but grew up in New Jersey. He graduated from Princeton University with a BA in Chemistry and a minor in Neuroscience. After a brief period exploring the possibility of going to culinary school, he attended medical school at The University of Southern California in Los Angeles. He completed a residency in Emergency Medicine at Henry Ford Hospital in Detroit. At work he has a special interest in harm reduction policies and wilderness medicine. When not working he enjoys spending time in the mountains, cooking, exploring live music and finding new breweries to try.
James Dolan, MD
After graduating with a BA in French and Histroy from University of Michigan, Dr. Dolan traveled the world for twelve years with his wife and two children, living in South Korea, the US Virgin Islands, Ecuador and Costa Rica. During that time, he taught High School French, History, Chemistry, Biology, Anatomy, Math and Physics and spent two years building houses in Costa Rica. He returned to University of Michigan for Medical School and completed his Family Medicine training at Sutter Medical Center, Santa Rosa at which point he fell in love with NorCal. He has been working in Emergency Medicine for the past fifteen years. Dr. Dolan enjoys biking, sailing, paddling, woodworking, grape farming, and doing almost anything with his young grandchildren.
Gary Fausone, MD
Dr. Fausone was born and raised in San Francisco and attended UC Santa Barbara where he received a BS in Genetic Engineering. After spending two years at the Salk Institute for Biological Studies, he attended McGill Medical School in Montreal. He completed his residency in Emergency Medicine at Metropolitan Hospital in Manhattan. Dr. Fausone is a diplomate with Board Certification in Emergency Medicine.
Duncan Johnston, MD
Dr. Johnston is a Northern California native who graduated from UC Davis with a BS in Genetics in 2007. He attended medical school at UC Davis and completed his Emergency Medicine residency at the University of Arizona. He is Board-Certified in Emergency Medicine.
He joined PRMG in 2016 and currently works at AHUV, AHHM and AHMC. He is the Vice Chief of Staff, the Emergency Department Director and the Trauma Director for AHUV. He previously served as the Chair of Infection Prevention and Pharmacy and Therapeutics.
Dr. Johnston lives in Ukiah with his family and is passionate about his work.
Alexandra "Lexi" Lambeck, MD
Dr. Lambeck graduated from UC Berkeley with a BA in Cognitive Science and a minor in Spanish Language. She attended medical school at UC San Diego and completed her Emergency Medicine residency at Highland Hospital-Alameda Health System in Oakland, CA. She is fluent in Spanish and takes special interest in evidence-based medicine and procedural excellence. Outside of work, she enjoys salsa dancing, home improvement projects, brewing the perfect cup of tea, and spending time with her two cats.
Linnea Lantz, MD
Dr. Lantz was born and raised in rural Northern California. She obtained her Baccalaureate Degree in Biology with minors in Chemistry and Spanish at the University of Redlands. For several years she worked as a chemist and microbiologist for a wastewater and drinking water laboratory in Southern California, then as a chemist for the UC Davis California Animal Health and Food Safety laboratory. She then decided to pursue a career as a physician.
She went to medical school at Western University of Health Sciences and completed her residency in Emergency Medicine at UC Davis Medical Center. She is board certified in Emergency Medicine.
She is passionate about rural medicine and serving rural communities. She practices full time at Adventist Clearlake.
She lives in Lake County with her husband and three sons. In her free time she likes to travel, read, and spend time outdoors collecting fossils and minerals.
Gregory Larsen, DO
Dr. Larsen is an osteopathic trained physician specializing in emergency medicine. He earned his bachelor of science from Humboldt State University, emphasizing in cellular molecular biology and minoring in chemistry graduating cum laude 1997. He then spent time in India working in rural housing development and shadowing international physicians on a “mobile medical bus”.
He came back to California to attend osteopathic medical school at Touro University in the Bay Area graduating in 2007. He subsequently spent two years as an adjunct instructor for this school later in his career. He completed a residency in Emergency Medicine at Arrowhead Regional Medical Center in Colton,California in 2011.
He joined PRMG in 2018 and works at AHHM and AHMC. He is currently the Emergency Department Director at Mendocino Coast.
He enjoys spending time with his wife and two older children. He loves to travel as much as possible. He also has a pension for spending long hours adventuring in nature. He endures ultramarathons, he completed the Ironman, and is an intermediate surfer.
Debbie Marks, MD
Dr. Marks attended Medical School and completed her Emergency Medicine Residency at Loma Linda University. She is Board Certified in Emergency Medicine.
Dr. Marks joined PRMG in 2006 and has served as Emergency Department Director and subsequently was elected as the CEO for PRMG, and served in that role for six years.
As part of the Medical Staff, she serves on the Credentials Committee, the CME Committee and the Medical Executive Committee for several years at AH Ukiah Valley.
Martha Montgomery, MD
No bio available
John Muraski, MD
Dr. Muraski works as an Emergency Physician. Originally from Los Angeles, he returned to school after completing service as a combat medic in the US Army earning his BS in Biochemistry and Molecular Biology from California Lutheran University and his PhD in Cell and Molecular Biology from UCSD. He spent his early career focused on medical research in multiple disciplines before founding several small biopharmaceutical companies prior to attending medical school at St. George’s University in Grenada. He completed a residency in Emergency Medicine at St. Joseph’s Medical Center in Stockton, CA. He utilizes an evidence-based approach to medical care and focuses his practice on underserved populations. In his time out of the hospital, he enjoys spending time with his wife and their two dogs, children and grandchildren. He continues to make time to travel throughout the world including medical missions. He is also an avid snowboarder, scuba diver, weightlifter, chef and gardener.
Wil Perez Velez, MD
Dr. Perez was born and raised in Puerto Rico. He moved to California in 2011 for medical school at Loma Linda University School of Medicine. He joined PRMG in 2020. He enjoys spending time with his wife and son, playing soccer, and playing trumpet.
Emily Coyle, MD
Dr. Emily Coyle is an emergency medicine physician. Originally from New Jersey, she earned her Bachelor of Arts in Biochemistry from the University of Florida and completed her medical degree at the University of Central Florida College of Medicine. She went on to complete her residency training in Emergency Medicine at Henry Ford Hospital in Detroit, followed by a fellowship in Emergency Ultrasound at the University of California, Davis. Dr. Coyle’s professional interests include point-of-care ultrasound, medical education, and quality improvement initiatives. In her free time, she enjoys exploring the outdoors, traveling, attending live music events, and spending time with her dog.
Sam Dercon, MD
Dr. Dercon was born in The Netherlands, but grew up in New Jersey. He graduated from Princeton University with a BA in Chemistry and a minor in Neuroscience. After a brief period exploring the possibility of going to culinary school, he attended medical school at The University of Southern California in Los Angeles. He completed a residency in Emergency Medicine at Henry Ford Hospital in Detroit. At work he has a special interest in harm reduction policies and wilderness medicine. When not working he enjoys spending time in the mountains, cooking, exploring live music and finding new breweries to try.
James Dolan, MD
After graduating with a BA in French and Histroy from University of Michigan, Dr. Dolan traveled the world for twelve years with his wife and two children, living in South Korea, the US Virgin Islands, Ecuador and Costa Rica. During that time, he taught High School French, History, Chemistry, Biology, Anatomy, Math and Physics and spent two years building houses in Costa Rica. He returned to University of Michigan for Medical School and completed his Family Medicine training at Sutter Medical Center, Santa Rosa at which point he fell in love with NorCal. He has been working in Emergency Medicine for the past fifteen years. Dr. Dolan enjoys biking, sailing, paddling, woodworking, grape farming, and doing almost anything with his young grandchildren.
Gary Fausone, MD
Dr. Fausone was born and raised in San Francisco and attended UC Santa Barbara where he received a BS in Genetic Engineering. After spending two years at the Salk Institute for Biological Studies, he attended McGill Medical School in Montreal. He completed his residency in Emergency Medicine at Metropolitan Hospital in Manhattan. Dr. Fausone is a diplomate with Board Certification in Emergency Medicine.
Duncan Johnston, MD
Dr. Johnston is a Northern California native who graduated from UC Davis with a BS in Genetics in 2007. He attended medical school at UC Davis and completed his Emergency Medicine residency at the University of Arizona. He is Board-Certified in Emergency Medicine.
He joined PRMG in 2016 and currently works at AHUV, AHHM and AHMC. He is the Vice Chief of Staff, the Emergency Department Director and the Trauma Director for AHUV. He previously served as the Chair of Infection Prevention and Pharmacy and Therapeutics.
Dr. Johnston lives in Ukiah with his family and is passionate about his work.
Alexandra "Lexi" Lambeck, MD
Dr. Lambeck graduated from UC Berkeley with a BA in Cognitive Science and a minor in Spanish Language. She attended medical school at UC San Diego and completed her Emergency Medicine residency at Highland Hospital-Alameda Health System in Oakland, CA. She is fluent in Spanish and takes special interest in evidence-based medicine and procedural excellence. Outside of work, she enjoys salsa dancing, home improvement projects, brewing the perfect cup of tea, and spending time with her two cats.
Linnea Lantz, MD
Dr. Lantz was born and raised in rural Northern California. She obtained her Baccalaureate Degree in Biology with minors in Chemistry and Spanish at the University of Redlands. For several years she worked as a chemist and microbiologist for a wastewater and drinking water laboratory in Southern California, then as a chemist for the UC Davis California Animal Health and Food Safety laboratory. She then decided to pursue a career as a physician.
She went to medical school at Western University of Health Sciences and completed her residency in Emergency Medicine at UC Davis Medical Center. She is board certified in Emergency Medicine.
She is passionate about rural medicine and serving rural communities. She practices full time at Adventist Clearlake.
She lives in Lake County with her husband and three sons. In her free time she likes to travel, read, and spend time outdoors collecting fossils and minerals.
Gregory Larsen, DO
Dr. Larsen is an osteopathic trained physician specializing in emergency medicine. He earned his bachelor of science from Humboldt State University, emphasizing in cellular molecular biology and minoring in chemistry graduating cum laude 1997. He then spent time in India working in rural housing development and shadowing international physicians on a “mobile medical bus”.
He came back to California to attend osteopathic medical school at Touro University in the Bay Area graduating in 2007. He subsequently spent two years as an adjunct instructor for this school later in his career. He completed a residency in Emergency Medicine at Arrowhead Regional Medical Center in Colton,California in 2011.
He joined PRMG in 2018 and works at AHHM and AHMC. He is currently the Emergency Department Director at Mendocino Coast.
He enjoys spending time with his wife and two older children. He loves to travel as much as possible. He also has a pension for spending long hours adventuring in nature. He endures ultramarathons, he completed the Ironman, and is an intermediate surfer.
Debbie Marks, MD
Dr. Marks attended Medical School and completed her Emergency Medicine Residency at Loma Linda University. She is Board Certified in Emergency Medicine.
Dr. Marks joined PRMG in 2006 and has served as Emergency Department Director and subsequently was elected as the CEO for PRMG, and served in that role for six years.
As part of the Medical Staff, she serves on the Credentials Committee, the CME Committee and the Medical Executive Committee for several years at AH Ukiah Valley.
Martha Montgomery, MD
No bio available
John Muraski, MD
Dr. Muraski works as an Emergency Physician. Originally from Los Angeles, he returned to school after completing service as a combat medic in the US Army earning his BS in Biochemistry and Molecular Biology from California Lutheran University and his PhD in Cell and Molecular Biology from UCSD. He spent his early career focused on medical research in multiple disciplines before founding several small biopharmaceutical companies prior to attending medical school at St. George’s University in Grenada. He completed a residency in Emergency Medicine at St. Joseph’s Medical Center in Stockton, CA. He utilizes an evidence-based approach to medical care and focuses his practice on underserved populations. In his time out of the hospital, he enjoys spending time with his wife and their two dogs, children and grandchildren. He continues to make time to travel throughout the world including medical missions. He is also an avid snowboarder, scuba diver, weightlifter, chef and gardener.
Wil Perez Velez, MD
Dr. Perez was born and raised in Puerto Rico. He moved to California in 2011 for medical school at Loma Linda University School of Medicine. He joined PRMG in 2020. He enjoys spending time with his wife and son, playing soccer, and playing trumpet.