Our Physicians

Cassie Amadio is a certified family nurse practitioner at Immediate Care.  She has more than 13 years of acute care experience, most recently at Quick Care Clinic in Casper. She also worked as a floor and float nurse at Wyoming Medical Center for 11 years, treating patients in several hospital departments including ICU, emergency, telemetry, neurology, surgical, medical and pediatrics.

Angela Booth is a certified family nurse practitioner at Immediate Care. She earned her associate’s degree in nursing at Casper College and worked in the Emergency Room at Wyoming Medical Center for 12 years. She earned her master’s degree in nursing from Walden University, completing coursework between shifts in the ER. She is married and has three children and two grandchildren. She enjoys singing at her church every Sunday.

Don Coulter is a nurse practitioner specializing in adult gerontology-acute care. He has more than 19 years of experience as a clinical nurse and manager. At Wyoming Medical Center, he has worked in the nursery, in the ICU and a as a flight nurse. Coulter see patients at Immediate Care.

Dr. Dunn is board certified in family medicine and is medical director of Mesa Primary Care and Sage Primary Care. He grew up in Denver and moved to Casper to complete his residency at University of Wyoming Family Practice. He was a Wyoming Medical Center hospitalist for several years. 

Dr. Erk is board certified by the American Board of Internal Medicine and is a fellow in the American College of Physicians. He earned his medical degree from the University of South Dakota School of Medicine in Vermillion and completed a residency in internal medicine at Geisinger Medical Center in Danville, Pa. He joined Wyoming Medical Center in 1994 and has served as chairman of the hospital’s Department of Medicine. He practices at Sage Primary Care.

Debbie Griner is a certified family nurse practitioner at Mesa Primary Care. She worked in the ICUs of large metropolitan teaching hospitals for many years and has also worked as a nurse practitioner in neurosurgery, pediatrics, cardiology and cardiac surgery. She and her family moved to Casper in 2007 where she was a nurse practitioner at Wyoming Cardiopulmonary Services and at Wyoming Cardiac Surgery, working with patients in both the inpatient and outpatient settings.  

Laura Heuer is a certified family nurse practitioner at Mesa Primary Care. Previously, she worked as a nurse at Wyoming Medical Center for many years. She began in Outpatient Services and the GI lab before transferring to the Emergency Department where she worked for 13 years.

Monica Janssen is a certified family nurse practitioner at Mesa Primary Care seeing patients of all ages. Previously, she worked at Wyoming Medical Center for 12 years, starting as a nurse’s aid on our neurology floor in April 2003 while attending nursing school at Casper College. She also worked in our Intensive Care Unit.

Dr. Melissa Knudson-Johnson is an internal medicine and pediatrics doctor which is called med-peds, a type of medical specialty which trains physicians to be board eligible in both pediatrics and internal medicine. She sees patients of all ages at Mesa Primary Care. She is board certified in pediatrics and is board eligible in internal medicine.

Dr. Adam Linck is a board-certified family practice physician at Sage Primary Care. He grew up in Riverton and became interested in medicine at age 6 when his grandfather was treated at Wyoming Medical Center for a heart attack. He is accepting patients of all ages. 

Dr. Lloyd joined Sage Primary Care in March 2006.  He has practiced medicine in Wyoming since 2002.  Dr. Lloyd is a member of the American Academy of Family Physicians.  He is also volunteer Medical Director for Nowcap.

Dr. April Rosalez is board certified in family medicine, and specializes in pediatrics. She sees patients of all ages at Mesa Primary Care. She trained at Wyoming Medical Center for two years and completed her residency at the University of Wyoming Family Medicine Residency in Casper.

Annette Russell is a certified physician assistant at Immediate Care and for our Clinical Decision Unit. Russell grew up in Casper and attended nursing school at Casper College. She previously worked as a nurse at Wyoming Medical Center and as a physician assistant in cardiology. She also worked as a physician assistant in Gastroenterology Associates in Casper. She enjoys spending time with family and friends and partaking in the many outdoor activities around Casper.

Jackie Smith-Lapp is a certified family nurse practitioner at Mesa Primary Care.

Previously, she was a registered nurse at Wyoming Medical Center working on the critical care float pool and as nursing supervisor. She was a nurse and nursing supervisor at West Park Hospital in Cody prior to coming to Casper. 

Matthew Strand is a certified physician’s assistant at Sage Primary Care. Strand grew up in Casper and always wanted a career in health care. He worked as an exercise physiologist, EMT and as a paramedic before going to get his degree as a physician assistant. He and his wife have two children. His medical philosophy, as well as his philosophy in life is to follow the Golden Rule: “Treat others the way I would want others to treat me and my family,” he said. He enjoys spending time with his family, playing soccer and board games, camping and golfing.

Dr. Strand is board certified in family medicine and is a fellow of the American Academy of Family Physicians. He grew up in Casper and graduated from Tulane University School of Medicine in 2006. He returned to Casper and trained at University of Wyoming Family Medicine. He now sees patients at Sage Primary Care. At Sage Primary Care, he is grateful to work every day with his brother, physician assistant Matt Strand. He is married with three children.  In his spare time, he enjoys weight lifting, golf, fishing, photography and cooking. 

Dr. Ketura Talbot is a board-certified family physician at Mesa Primary Care. She attended medical school through the WWAMI program (an acronym for participating states – Washington, Wyoming, Alaska, Montana and Idaho). She enjoys camping and getting outdoors, and is exploring photography and martial arts.

Dr. Anca Voinov is a board-certified family practice physician at Sage Primary Care. She completed two medical degrees, studying in Romania and the Netherlands, and has completed research in viral culture techniques. She was awarded the Biopsychosocial Model and Family-Centered Care Award and the McLaren Family Practice Residency Program’s Employee of the Year Award. 

Dr. Wells is a board-certified in family practice physician at Sage Primary Care. She grew up in Rochester, N.Y., and was interested in science from a young age. She earned her medical degree at State University of New York at Stony Brook. She became interested in rural primary care after hearing stories about her mentor’s residency and practice around Greeley, Colo. Dr. Wells completed her residency at the University of Wyoming Family Medicine in Casper. She returned to Casper in 2002 and joined Sage Primary Care in 2013. Dr. Wells has special interests in hospice care, pediatrics and well family care.

Dr. Binder is a family practice physician at Western Medical Associates.