Dr. Coker hails from Dallas, Texas. He did his undergraduate studies at the University of Texas, completed his medical school training at the University of Texas Medical Branch and came to the Saddleback community in 1983. He performed both his internship and residency at Los Angeles County, University of Southern California.

He is fellowship trained from The Joseph Boyes Foundation for Research in Hand Surgery, Los Angeles, California. He is a member of the American Academy of Orthopaedic Surgeons and the American Society for Surgery of the Hand and is currently the Secretary/Treasurer of the Southern California Society for Surgery of the Hand.