Dr. Marcum attended California Polytechnic State University, San Luis Obispo and is a graduate in Marine Biology from The University of Southern California in 1979. He received his dental education and endodontic specialty training at the School of Dental Medicine, University of Southern California in 1984 and 1986 respectively.
Dr. Marcum taught undergraduate endodontics at The University of Southern California. He has served as a mentor for office design with The American Association of Endodontists as well as been a member of The Scientific Sessions Committee with the California Dental Association. Dr. Marcum has written and contributed to, numerous articles in the field of endodontics. He served as President of the Central Coast Dental Society for the year 2019-2020.
Dr. Marcum was raised in Santa Maria where his father practiced general dentistry for forty six years until his retirement in 2003 and his mother was a dental hygienist for forty years. Dr. Marcum started his endodontic career in Torrance, California where he practiced for five years. He then returned to the Central Coast and established his practice in San Luis Obispo in 1992.