Our Physicians

David Adkison , M.D.


Dr. David Adkison is the senior surgeon and founder of the American Physicians Group. He is a native of Alabama and performed his residency at the National Naval Medical Center, Bethesda, Maryland, where he later served as Chairman. His patients have included President Bill Clinton, members of Congress, the Supreme Court and elite military members. His sub specialty training was in arthroscopy, knee and shoulder surgery, which constitutes the entirety of his practice. He is annually ranked as one of America’s top doctors and best orthopedic surgeons by patients and peers.

Dan Valaik, M.D.

Director of Education

Dr. Dan Valaik is the director of education for APG; he is currently on faculty at Johns Hopkins Medicine where he received sub specialty training in joint replacement surgery. He graduated with honors from the US Naval Academy and then served as a Navy SEAL for 6 years. As a SEAL he learned that, "The only easy day was yesterday"! After medical school, he performed his residency at the National Naval Medical Center, where he later served as Chairman. His patients have included members of Congress, the Supreme Court, Admirals and Generals, and elite military members.

Roy J. Carls, M.D.

Dr. Carls is a board certified orthopedic surgeon specializing in knee, shoulder and ankle arthroscopic reconstruction and knee and shoulder replacements. He is also fellowship trained in foot and ankle complex reconstruction. in the United States, he owns his private practice, Peak Performance Orthopedics in Cumberland, MD. His training includes undergraduate bachelors of science degree at UCLA, medical doctorate degree while in the Navy at the Uniformed Services University of the Health Sciences in Bethesda, MD, surgical internship at Portsmouth Naval Hospital and orthopedics residency at National Medical Center and foot and ankle fellowship at Union Memorial Hospital in Baltimore. While active duty in the Navy he served as a flight surgeon with the Marines in Cherry Point, NC and as a staff orthopedic surgeon at the Naval Academy in Annapolis, MD and at the National Naval Medical Center. He lives in Ridgeley, WV on a farm with his wife, son and daughter.

Chad Smalley, M.D.

Dr. Chad Smalley is a native of Tennessee, where he currently resides. He performed his subspecialty training in arthroscopy and shoulder surgery in San Francisco, where he also served as team physician for the major league baseball San Francisco Giants. He has significant experience in Orthopedics in Shanghai, where he enjoys an excellent reputation.

Tudor Tien, M.D.

Dr. Tudor Tien is a graduate of Columbia College and the University of Michigan Medical School. He performed his residency at the National Naval Medical Center and subspecialty training in arthroscopy/ foot and ankle surgery at Union Memorial Hospital in Baltimore. He currently resides in Michigan and serves on the clinical faculty of Michigan State College of Medicine.

Greg Wolff, M.D.

Dr. Gregg Wolff is an arthroscopy/sports medicine surgery subspecialist from Maryland, where he completed his undergraduate degree, medical school and residency. He received subspecialty training at the University of Oklahoma; his military service led to his rank as a US Navy Captain. He currently has a very busy private practice focusing on arthroscopy of the knee and shoulder.

Christopher Bookout, M.D.

Dr. Chris Bookout completed his residency at the National Naval Medical Center, Bethesda, Maryland, after serving as a Navy flight surgeon. He serves as a team physician for USA Hockey and has accompanied multiple national teams to tournaments overseas. He has served as a team physician with minor league hockey and arena football teams in Pensacola, Florida. In his spare time, Chris runs marathons. The primary focus of his practice is sports medicine, with an emphasis on knee and shoulder arthroscopy.

Scotty Bew, M.D.

Dr. Scotty Bew is a Primary Care Sports Medicine specialist and former US Navy Captain from Florida. He graduated from the College of William and Mary and the Uniformed Services University military medical school. He completed his residency in Family Medicine at the Naval Hospital Pensacola, Florida and his Sports Medicine fellowship at the Naval Hospital Camp Pendleton, California. He has served as Chief Operations Officer and as Chief Medical Officer at multiple institutions. He also has served as team physician for US Naval Academy Preparatory school, all-Military rugby, boxing and soccer teams, and the All- Navy Rugby team.

Christian Clark, M.D.

Dr. Christian Clark practices arthroscopic/pediatric orthopedic surgery in Charlotte, North Carolina. A former US Marine, he performed his orthopedic residency at the National Naval Medical Center with subspecialty training at Nemours Hospital in Gainesville, Florida. He served with the Navy in Iraq and has authored and edited numerous scientific publications.

James Worthen, M.D.

Dr. James Worthen is from Birmingham, Alabama, where he performed his residency at the University of Alabama. A three time all-American in lacrosse, he has long focused on treatment of injuries to the knee and shoulder. He received subspecialty training in arthroscopy/knee and shoulder surgery in Taos, New Mexico. He enjoys an exceptionally busy practice and is a partner of Dr. Adkison.

Steve Yao, M.D.

Dr. Steve Yao practices orthopedics in Salem, Oregon, with a focus on arthroscopic knee and shoulder surgery. He completed medical school at Rush Medical College in Chicago, residency at The Medical College of Wisconsin and subspecialty training in Lake Tahoe, California. He is a former United States Air Force officer with over 14 years of orthopedic experience. Prior to becoming an orthopedic surgeon he worked as a physical therapist. This experience provided him with a unique perspective on managing orthopedic problems. He is passionate about providing patients an outstanding experience and the highest quality of care.

Andrew Cumiskey, M.D.

Dr. Andrew Cumiskey practices in the Maryland eastern shore area. He is a graduate of Jefferson Medical College and spent several years as a Navy Flight Surgeon. He then performed his residency at the National Naval Medical Center and was subsequently department head at the Naval Hospital Beaufort. His practice focuses on arthroscopic knee and shoulder surgery

Elizabeth Moran, M.D.

Dr. Elizabeth Moran is a pediatric orthopaedic surgeon who has practiced at Wolfson Children’s Hospital in Jacksonville FL for over 10 years. She is a native of New Hampshire, attended Boston University School of Medicine and did her residency training at the National Naval Medical Center. She practiced general orthopaedic surgery at Naval Hospital Jacksonville for 5 years and then underwent subspecialty (pediatric orthopaedics) training at Nemours Children Specialty Care. Currently her practice focus includes all aspects of pediatric orthopaedics, including ankle, knee and shoulder arthroscopy. She is involved in educating current orthopaedic residents from the University of Florida and the Mayo Clinic.

Skip Chitwood, M.D.

Dr. O.H. Chitwood has been in practice for over twenty years. He did his residency in Orthopaedic surgery at the National Naval Medical Center and his upper extremity fellowship training at Thomas Jefferson Hospitals in Philadelphia. He currently practices in south Alabama. He has had the privilege of caring for college and professional athletes for many years and focuses on minimally invasive and arthroscopic techniques for arthritis as well as sports related problems.

Dan Sewell, M.D.

Dr. Sewell resides in Salem, Oregon where he is a founding partner and president of the premiere Orthopedic group in the state. Known for his warm and comforting bedside manner, his practice is devoted to the evaluation and treatment of sports medicine patients with a particular focus on arthroscopic knee and shoulder surgery. A graduate of Washington University in St Louis School of Medicine, one of the top medical research and training programs in the county, he completed his residency at the National Naval Medical Center. His patients have included members of Congress, the Supreme Court, President Clinton and professional athletes. He is recognized by his peers and patients as one of the best orthopedic surgeons in the country.