Adrian Lewis Peterson is an American football running back who is a free agent. He played college football at Oklahoma, where he set the freshman rushing record with 1,925 yards during the 2004 season. Named a unanimous All-American that year, he became the first freshman to finish as a runner-up in the Heisman Trophy balloting. Peterson finished his college football career as the Sooners' third all-time leading rusher. He is widely considered to be one of the greatest running backs in football history.