Tim S. Grover is the CEO of Attack Athletics, Inc., which he founded in 1989, and author of the international bestseller Relentless: From Good to Great to Unstoppable. World-renowned for his work with Michael Jordan, Kobe Bryant, Dwyane Wade, and thousands of athletes and business professionals, he appears around the world as a keynote speaker and consultant to business leaders, athletes, and elite achievers in every field. He is based in Chicago. Shari Lesser Wenk is the cowriter of Tim Grover's Relentless as well as Start Something with Earl Woods and the Tiger Woods Foundation. She has been a sports agent and bestselling collaborator since 1983. She lives in Chicago.