Our Physicians

Melissa Knudson-Johnson, MD

Melissa Knudson-Johnson M.D.

Internal Medicine/Pediatrics

Mesa Primary Care 3632 American Way
Casper, WY 82604 directions

phone (307) 234-6765
fax (307) 234-6998

Dr. 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.

Dena L'Heureux M.D.

Intensivist - Pulmonary Medicine, Critical Care

Wyoming Medical Center 1233 E. Second St.
Casper, WY 82601 directions

phone (307) 577-7201
fax (307) 577-2751

Dr. L'Heureux is an intensivist in the Wyoming Medical Center ICU specializing in internal medicine, pulmonary disease, critical care and hospice/palliative care.

Jason Lloyd

Jason Lloyd M.D.

Family Practice

Sage Primary Care 1020 S. Conwell St.
Casper, WY 82601 directions

phone (307) 265-8300
fax (307) 233-8230

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.

Nida Mahid D.O.

Hospitalist - Internal Medicine

Wyoming Medical Center 1233 E. Second St.
Casper, WY 82601

phone (307) 577-7201
fax (307) 577-2751

Dr. Mahid is a hospitalist at Wyoming Medical Center, specializing in internal medicine.

Mark McGinley, M.D.

Mark Mc Ginley M.D.

Intensivist - Pulmonary Medicine, Critical Care, Integrative Medicine

Wyoming Medical Center 1233 E. Second St.
Casper, WY 82601 directions

phone (307) 577-7201
fax (307) 577-2751

Dr. Mark Mc Ginley is an intensivist at Wyoming Medical Center.

Robert Neff

Robert Neff M.D.

Nephrology

Wyoming Nephrology 419 S. Washington St., Suite 102
Casper, WY 82601 directions

phone (307) 237-5047
fax (307) 235-4017

Dr. Neff is a nephrologist at Wyoming Nephrology.  

Toni Patik P.A.

Family Medicine

Sage Primary Care 1020 S. Conwell St.
Casper, WY 82601

phone (307) 265-8300
fax (307) 233-8230

Toni Patik is a certified physician's assistant at Sage Primary Care. She grew up in Casper and was an environmental chemist for 15 years before pursuing her career in medicine.She earned her physician assistant degree from the University of Colorado Health Sciences Center in Denver. She worked in family practice in Gillette for two years before returning to Casper in 2001 to join the local Veterans Administration clinic, where she practiced for 10 years. She then practiced for five years at Rocky Mountain Oncology followed by a brief time as a hospitalist physician assistant in Rock Springs. While she specialized in children health during her training, she is accepting patients of all ages at Sage Primary Care.

Vishwanath Pattan M.D.

Endocrinology

Wyoming Endocrine & Diabetes 245 S. Fenway St.
Casper, WY 82601 directions

phone (307) 577-2592
fax (307) 577-4312

Dr. Pattan is board certified in internal medicine. He completed an endocrinology research fellowship at Mayo Clinic and a clinical endocrinology fellowship at Harbor UCLA/City of Hope in California. Dr. Pattan grew up in India, a country with a near pandemic of diabetic patients. He chose endocrinology because he thought he could make a big health impact by helping patients manage and prevent diabetes. 

Cody McVay Pruitt F.N.P.

Pain management

Wyoming Pain Center 6660 E. Second St.
Casper, WY 82609

phone (307) 266-4000
fax (307) 995-8112

Cody McVay Pruitt is a certified family nurse practitioner specializing in pain management.

Vidya Raj Krishnamurthy M.D.

Hospitalist - Internal Medicine, Nephrology

Wyoming Medical Center 1233 E. Second St.
Casper, WY 82601

phone (307) 577-7201
fax (307) 577-2751

Dr. Raj Krishnamurthy is a hospitalist at Wyoming Medical Center, specializing in internal medicine and nephrology.

Khizran Rizvi M.D.

Hospitalist - Internal Medicine

Wyoming Medical Center 1233 E. Second St.
Casper, WY 82601

phone (307) 577-7201
fax (307) 577-2751

Dr. Rizvi is a hospitalist at Wyoming Medical Center specializing in internal medicine.

April Rosales, DO

April Rosalez D.O.

Family Practice

Mesa Primary Care 3632 American Way
Casper, WY 82604 directions

phone (307) 234-6765
fax (307) 234-6998

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 P.A.

Immediate Care

Wyoming Medical Center 1233 E. Second St.
Casper, WY 82601

phone (307) 577-7201
fax (307) 577-2751

Annette Russell is a certified physician assistant in our Clinical Decision Unit at Wyoming Medical Center. 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.

Eric Sawyers M.D.

Nephrology

Wyoming Nephrology 419 S. Washington St., Suite 102
Casper, WY 82601 directions

phone (307) 237-5047
fax (307) 235-4017

As an internist and nephrologist with the Office of Attending Physician of Congress, Dr. Eric Sawyers provided care to 16 United States Senators and 75 Congressmen on 15 separate missions to 65 countries, including missions to North Korea, Libya and four different war zones. During Operation Iraqi Freedom, he performed the first U.S. military combat-related dialysis since the Vietnam War. He is a graduate of the United States Naval Academy and the Uniformed Services University of the Health Services in Bethesda, Md.

William Shughart P.A.

Family Practice

Immediate Care 3632 American Way
Casper, WY 82604

phone (307) 233-7300
fax (307) 233-7301

Jackie Smith-Lapp F.N.P.

Family Practice

Immediate Care 3632 American Way
Casper, WY 82604 directions

phone (307) 233-7300
fax (307) 233-7301

Jackie Smith-Lapp is a certified family nurse practitioner at Immediate 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. 

Ketura Talbot M.D.

Family Practice

Mesa Primary Care 3632 American Way
Casper, WY 82604 directions

phone (307) 234-6765
fax (307) 421-3148

Dr. 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.

Amanda Vignaroli F.N.P.

Family practice

Sage Primary Care 1020 S. Conwell St.
Casper, WY 82609

phone (307) 265-8300
fax (307) 233-8230

Amanda  Vignaroli is a certified family nurse practitioner at Sage Primary Care. She has more than 10 years of nursing experience in operating rooms, pediatrics, outpatient orthopedics, medical floors and in family medicine.

She was born and raised in Casper, and she made a goal early on to become a nurse practitioner after both of her grandmothers started nursing school but weren’t able to finish their degrees. She earned her Doctorate of Nursing Practice degree at the University of Northern Colorado where she gained clinical experience in urgent care, family medicine, pediatrics and women’s health.

Anca Voinov M.D.

Family Practice

Sage Primary Care 1020 S. Conwell St.
Casper , WY 82601 directions

phone (307) 265-8300
fax (307) 233-8230

Dr. 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. 

Lee Warren, MD

W. Lee Warren, Jr. M.D.

Neurosurgery

Advantage Orthopedics & Neurosurgery 6600 E. Second St.
Casper, WY 82609

phone (307) 266-4000
fax (307) 266-4545

Dr. Lee Warren is a board-certified neurosurgeon and a retired major of the United States Air Force. He was only the second U.S. Air Force neurosurgeon to be deployed to a wartime hospital since the Vietnam War, performing combat brain and spinal surgery during Operation Iraqi Freedom. He practices at Advantage Orthopedics and Neurosurgery, providing comprehensive care of the brain and spine. 

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