Found online:
"Witty, sophisticated, urbane and yet a man of the people, [George Plimpton] embodied the American optimism of 1960s and '70s. He co-founded and edited one of the most influential literary magazines in history, The Paris Review for 50 years, and in the process, he innovated a writing technique called participatory journalism. This gave Plimpton a unique perspective on the activities he wrote about, perhaps most famously with Paper Lion, a bestseller, which has never left the conversation of the greatest sports books of all-time."
http://www.filmlinc.com/films/on-sale/plimpton-starring-george-plimpton-as-himself