Yosef Johnson has nearly 24 years of sports performance training experience, and began working with Dr. Michael Yessis in 1994 as his protégé. He formed Ultimate Athletic Concepts (UAC) in 2003 and began publishing books in 2005. Yosef has had the unique privilege of close correspondence with top Soviet experts in the world of sport and human performance. He has worked with athletes from youth to pro level. He routinely consults with and mentors a number of strength coaches in the private and scholastic sectors, and has been a major player in the spread and implementation of the 1x20 strength training system invented by Dr. Yessis. Yosef oversees the physical education program for the Reeths-Puffer School District in Michigan.