Faculty & Staff

Faculty and Staff

Mitchell Ryan Davis, M.D
Program Director

Ryan Davis is a family medicine physician, board-certified in that specialty since 1998. He graduated with his M.D. from the Boston University, School of Medicine in 1995. Dr. Davis completed his residency in family medicine in 1999 at Franciscan Medical Center in Dayton, Ohio, formerly St. Elizabeth Medical Center. In 1998, Dr. Davis accepted full-time employment with The Chickasaw Nation at Carl Albert Indian Hospital, now known as the Chickasaw Nation Medical Center, where he currently serves as the Program Director for the Family Medicine Residency. Dr. Davis has held a number of clinical appointments in his career. He has served as chief of staff, chairman of morbidity and mortality committee, member of credentials committee, chairman of pharmacy and therapeutics committee, and currently serves as chairman of Medisaw Committee/Contract Health. Dr. Davis loves spending time with his wife of 27 years, Marcy. They have two children: a son, Taylor who is currently attending Oklahoma State University; and a daughter Madison, who is attending the University of Oklahoma. Dr. Davis enjoys collecting comic books and is a huge Thunder basketball fan. He enjoys exercise and the outdoors, loves to travel and spend time with his family and friends. He also is a world-known judge of Pokémon, judging tournaments around the world.


Steven Fillmore, M.D, FACP, MBA
Core Faculty

Steven Fillmore is an internal medicine physician, board-certified in that specialty since 1985. He graduated with an M.D. from the University of Oklahoma in 1982 and completed residency in Oklahoma City, Oklahoma, at the University of Oklahoma Tulsa Medical College. In 2012, Dr. Filmore accepted full-time employment with the Chickasaw Nation Department of Health, where he serves as Chief of Inpatient Medicine, Chief of Staff Elect, Chair of the P&T Committee and Chair of the HIM Committee. Dr. Fillmore has been married to his wife and best friend, Lisa, since 1979. They have three sons and one daughter-in-law. He enjoys working on his ranch and strives to learn something new each day.


Tessa Ray
Program Coordinator

In 2011, Ray accepted a full-time position with the Chickasaw Nation Department of Health, where she currently serves as the Program Coordinator for the Family Medicine Residency. Prior to the residency program, she was the Medical Support Services Coordinator. Ray lives in Ada, Oklahoma. She has two sons and a cat. She enjoys Thunder basketball, OSU football, loves to travel, and spend quality time with her family.

Last Updated: 10/10/2018