Howell was born and raised in Augusta, Georgia, home of the Masters Tournament. He started playing golf at age 7, and has never looked back. He attended Oklahoma State University, a perennial collegiate golf powerhouse. In 2000, OSU won the NCAA Golf Championship and Howell was crowned as the individual champion. He turned professional later that same year. Howell became a full PGA Tour member in 2002 and won his first PGA Tour tournament that season. In 2007, Howell registered his second PGA Tour victory. Howell also participated in the Presidents Cup that September, winning two matches that contributed to a U.S. victory.