Tim S. Grover is the CEO of Attack Athletics, Inc., founded in 1989. World-renowned for his work with Michael Jordan, Kobe Bryant, Dwyane Wade, and hundreds other sports and business professionals, he is the preeminent authority on the science and art of physical and mental dominance. He is the author of the national bestseller Relentless: From Good to Great to Unstoppable and creator of the digital training platform The Relentless System. Tim speaks around the world to a wide variety of audiences and appears on numerous media outlets. A former NCAA Division I basketball player at the University of Illinois-Chicago, he was inducted into the UIC Hall of Fame and received its Lifetime Achievement Award in 2010. He lives in Chicago.

Shari Lesser Wenk, is the cowriter, with Tim Grover, of Relentless, and with Earl Woods, of Start Something. She has been a literary agent, editor, and ghostwriter of sports books since 1983. She lives in Chicago. Less