Our residents come from around the country and around the world, bringing with them a wide variety of unique experiences and perspectives as they continue their medical studies at Yuma Regional Medical Center.
Third Year Residents
Arthur Ayvazian, M.D.
Dr. Arthur Ayvazian was born and raised in Los Angeles. He studied Pre-med at University of California, Irvine and earned his medical degree from Ross University School of Medicine. His areas of clinic interest include: Sports medicine, rehabilitation, nutrition, preventative medicine and community medicine. He hopes to use skills through global outreach and humanitarianism to help improve access to healthcare for the underserved. Dr. Ayvazian enjoys cooking, camping, hiking, SCUBA diving, traveling, fitness and hockey.
Richard P. Kozinski, M.D.
Dr. Richard P. Kozinski grew up in Chugiak, Alaska. Before moving to Yuma, he lived in Goodyear, Ariz. He earned his medical degree from Medical University in Lodz, Poland. His clinic areas of interest area are diabetes and rheumatology. In his spare time, Dr. Kozinski enjoys hiking, cooking, cycling and traveling.
Kelley Lizarraga, M.D.
Dr. Kelley Lizarraga was born and raised in Santa Monica, Calif., the daughter of immigrant parents from Lima, Peru. She completed my bachelor’s degree in Cell and Molecular Biology at San Diego State University and earned her medical degree from Universidad Autonoma de Guadalajara. Her clinical areas of interest include working in community-based medicine, focusing on patient and family-centered care, and striving to reduce healthcare disparities. In her spare time, Dr. Lizarraga enjoys working out, swimming, traveling, making jewelry and spending quality time with my family.
Steffano Mottl, M.D.
Dr. Steffano Mottl was born in Lima, Peru, but considers Pensacola, Florida, to be his hometown. He earned his medical degree from St. George's University in Grenada. His area of clinic interest is sports medicine. This year, he launched a medical campaign in Coya, Peru, that helped provide medical attention for people with poor access to specialty care. Dr. Mottl’s personal interests include traveling, meditating, praying, listening to coaching podcasts, playing soccer and surfing.
Kelvin Ng, M.D.
Dr. Kelvin Ng was born in Hong Kong and grew up in San Francisco. He earned his medical degree from Ross University. His clinical areas of interest include sports medicine, integrative medicine, and global health. Dr. Ng’s personal interests range from triathlons and endurance sports to playing the ukulele.
Lauren Novitskie, M.D.
Dr. Lauren Novitskie was born and raised in Vineland, New Jersey. She earned her medical degree from St. George's University, Grenada. Her clinical areas of interest include emergency medicine and sports medicine. In her spare time, Dr. Novitskie enjoys running, playing basketball, working out and spending time with family and friends.
Daniel Placik, M.D.
Dr. Daniel Placik was born and raised in Los Angeles. He earned his medical degree from Universidad Autonóma de Guadalajara. His areas of clinical interest include public health, sports medicine, and urgent care. Dr. Placik’s personal interests include maintaining an active lifestyle, playing piano, enjoying an occasional basketball game and spending quality time with family.
Second Year Residents
Matthew Bishop, M.D.
Dr. Matthew Bishop was born and raised in San Diego, California. He studied Biology at the University of San Diego and earned his medical degree from Ross University School of Medicine. Dr. Bishop's patient care philosophy centers around improving his patients' health literacy and health empowerment, while delivering culturally sensitive care. He holds particular clinical interests in preventive medicine and global health. His pastimes include cooking, traveling and camping with his wife and son.
Osa Guobadia, M.D.
Dr. Guobadia was born and raised in Nigeria. He earned his medical degree from Ross University School of Medicine. His areas of clinical interest include a mixture of inpatient and ambulatory medicine. Dr. Guobadia’s patient care philosophy revolves around his belief that healthcare is a universal human right and that all patients should have access to affordable, high-quality care. In his spare time, he enjoys sports and current affairs.
Carlos A. Mancilla, Jr., M.D.
Dr. Mancilla was born in New York City and grew up in Albany, NY. He earned his medical degree from SUNY Upstate Medical University in Syracuse, NY. His areas of clinical interest include emergency medicine, urgent care, surgery, rural medicine and obesity medicine. Dr. Mancilla describes his care philosophy as excellent medical care delivered with empathy, compassion and respect. His personal interests include soccer, strength training and spending time with friends and family.
Tamara Sanderson-Dissanayake, M.D.
Dr. Sanderson was born in Baltimore and raised in a small Massachusetts town. She worked as a laboratory medical technologist in Boston before becoming a physician. She earned her medical degree from the Indiana University School of Medicine and an MPH from Oregon Health & Science University - Portland State University. Dr. Sanderson’s clinical interests include chronic conditions, nutrition, mental health and preventive medicine. She hopes her career involves working in an underserved area and advocating for healthy communities. She enjoys outdoor activities with her husband and friends, container gardening, fitness, knitting, cooking and dancing.
Palak Satija, M.D.
Dr. Palak Satija was born in New Delhi, India and moved to Calgary, Alberta, Canada in her youth. She earned her medical degree from the Medical University of Lodz in Lodz, Poland. She believes in being the patient's strongest advocate during their entire healthcare journey, while providing care that is respectful of and responsive to individual patient preferences, needs and values. Dr. Satija's areas of clinical interest include community outreach, preventative medicine, nutrition and global health. In her spare time, Dr. Satija enjoys maintaining an active lifestyle, traveling, watching tennis and spending quality time with family and friends.
Aaron Shumway, M.D.
Dr. Aaron Shumway was born in Austin, Texas, to a military family. He spent his childhood in Wetumpka, Alabama, but considers Chandler, Arizona, his hometown. He earned his medical degree from Ross University School of Medicine. His clinical interests include rural medicine and women’s health. In his spare time, he enjoys reading, playing games and spending time with his three children.
Wesley Luke Taylor, M.D.
Dr. Wesley Luke Taylor is originally from Johnson City, Tennessee. He earned his medical degree from the American University of Integrative Sciences School of Medicine in St. Michael, Barbados. He also holds an MBA from Davenport University in Grand Rapids, Michigan. His areas of clinical interest include leadership in healthcare, rural community medicine, nutritional and gastrointestinal disease, sports medicine and behavioral health. When he’s not practicing medicine, Dr. Taylor loves spending time with his family usually while enjoying outdoor activities, like running, biking, camping, swimming, hiking or fishing.
Silas Wiefelspuett, M.D.
Dr. Silas Wiefelspuett was born and raised in Aachen, Germany. He pursed his undergraduate degree at the University of Victoria in Victoria, British Columbia, Canada as well as a graduate degree in physiotherapy at the University of British Columbia in Vancouver, British Columbia, Canada. He attended medical school at Saint James School of Medicine in Anguilla. His clinical interests include obstetrics, border health, sports medicine and rural family medicine. Dr. Wiefelspuett enjoys spending time in the outdoors with his family as well as participating in trail running, climbing and skiing.
First Year Residents
Kristianne Amurao, M.D.
Dr. Amurao was born in Sacramento, California, and grew up in Roseville, California. She earned her medical degree from Ross University School of Medicine. Her clinical areas of interest include sports medicine, integrative medicine and community outreach. Her patient care philosophy involves taking care of not only the disease, but the person as a whole — caring for their physical and mental well-being. In her spare time, she enjoys fitness activities, Pilates, and spending time with family.
Dina Bacon, M.D.
Dr. Bacon was born in Alexandria, Louisiana, but grew up in the town of Elizabeth. She earned her medical degree from Atlantic University School of Medicine, St. Lucia. Her areas of clinical interest include family medicine, emergency medicine, sports medicine and medical education. Dr. Bacon’s patient care philosophy focuses on treating each patient as an individual and providing them with the care that a doctor would want for her family members. Her personal interests include going to the beach, a “secret love” for fishing, traveling, container gardening and spending time with her family.
Lee Barnwell, M.D.
Dr. Barnwell was born in Lancaster, Ohio, but considers Beaver Dam, Kentucky, to be home. He earned his medical degree from the University of Medicine and Health Sciences in St. Kitts. His clinical areas of interest include rural community medicine, sports medicine, leadership in health care and pediatrics. Dr. Barnwell’s patient care philosophy focuses on providing compassionate, respectful care to all patients as they navigate the healthcare system. His personal interests include spending time with his wife and daughter, singing karaoke, playing tennis and swimming.
Stephanie Clark, M.D.
Dr. Clark was born and raised in Queens, New York. She earned her medical degree from St. James School of Medicine Anguilla. Her clinical areas of interest include all aspects of family medicine, sports medicine and urgent care. Dr. Clark’s patient care philosophy focuses on care for the whole patient, taking into account their individual social, cultural, and medical needs. She stresses the need to educate patients and family members about their disease or illness, teaching them the behaviors needed to promote their recovery and long-term wellbeing. Her personal interests include cheering for Real Madrid, working with her hands and tackling home renovations.
Michael McCullagh, M.D.
Dr. McCullagh was born and raised in Ottawa, Canada. He earned his medical degree at the University of Medicine and Health Sciences, St. Kitts and Nevis. His clinical areas of interest include caring for the underserved, global health and emergency care. Dr. McCullagh’s patient care philosophy involves reaching beyond the doctor's office through educational initiatives, raising awareness of systemic healthcare disparities and investing in integrative and preventative medicine. His personal interests include being outdoors, traveling, hiking, camping and exploring new places.
Nafisah Naqvi, M.D.
Dr. Naqvi was born and raised in Southern California. She earned her medical degree at Ross University, which offered the “humbling opportunity” to experience her first two years of medicine on the island of Dominica. She attended her final two years of medical school at California Hospital Medical Center in Los Angeles. Her clinical interests include pediatrics and women's health. Dr. Naqvi’s patient care philosophy focuses on her role as a patient educator. She empowers them with knowledge to exercise a greater role in their wellbeing. Her personal interests include nature, going on walks and jogs, the gym, reading and spending time with family and friends.
Surur Sharif, M.D.
Dr. Sharif was born in Atlanta, but considers Dubai, United Arab Emirates (UAE) home. She earned her medical degree from Gulf Medical University, located in the UAE. Her areas of clinical interest include preventative medicine and mental health. Dr. Sharif’s patient care philosophy focuses on serving as her patient’s’ advocate and involving them in the creation of their treatment plans. Her personal interests include enjoying every form of dance, especially tap and hip hop.
Mina Tawadrous, M.D.
Dr. Tawadrous was born in Cairo, Egypt, but grew up in Kuwait and the United States. He considers Claremont, California, to be home. He earned his medical degree from St. George's University in Grenada. His areas of clinical interest include community and underserved medicine. Dr. Tawadrous’s patient care philosophy involves treating every patient as if he was treating a member of his own family. His personal interests include working on cars, attending car-related events, playing soccer, listening to music and playing the piano.