Dr. Herrell received his B.S. in Microbiology at The University of Maryland, College Park in 1983 and his D.D.S. degree at The University of Maryland, Baltimore School of Dentistry in 1987. A resident of Frederick County, he is married with two children. He has practiced dentistry in Frederick since 1988, first as an associate in another dental practice and then in 1991 as founder of Modern Dentistry of Frederick. Dr. Herrell is a member of the American Dental Association, Maryland State Dental Association and the Frederick County Dental Society.