Nick Nanton is an award winning director, agent, and author. He is a 5 time Emmy Award winner for directing and producing the short films Jacob's Turn, Esperanza, Mi Casa Hogar, and Visioneer. Nanton is a 13 time Telly Award winner and has co-authored several best-selling books. He is the founder and CEO of The Dicks and Nanton Celebrity Branding Agency. Using only the above description and what you know about the world, "Nanton is not the sole author of any of his best-selling books." is definitely correct, incorrect, or inconclusive? 