Mark Hatmaker is the bestselling author of Boxer's Book of Conditioning & Drilling, Boxing Mastery, the MMA Mastery series, the No Holds Barred Fighting series, and No Second Chance. He has produced more than 40 instructional videos and he has extensive experience in the combat arts including boxing, wrestling, Jiu-jitsu, and Muay Thai. A highly regarded coach of professional and amateur fighters, law enforcement officials, and security personnel, he is also the founder of Extreme Self Protection, a research body that compiles, analyzes, and teaches the most effective Western combat methods known. He lives in Knoxville, Tennessee.