More No Holds Barred Fighting: Killer Submissions (No Holds Barred Fighting series)
Mark Hatmaker is the founder of Extreme Self Protection, a research company that compiles, analyzes, and teaches effective unarmed combat methods. He has 23 years of experience in the martial arts, including boxing, wrestling, Jiu-jitsu, and Muay Thai. He is the author of No Holds Barred Fighting. He lives in Knoxville, Tennessee. Doug Werner is the author or coauthor of 15 sport and fitness instructional guides, including the Start-Up Sports series. He lives in San Diego, California.