Education
He graduated in 2000 and ventured into sprint car racing, competing in a number of series across the midwestern United States.
He graduated in 2000 and ventured into sprint car racing, competing in a number of series across the midwestern United States.
After karting, Gregg began in cars in amateur SCCA Formula Atlantic in 1998 and 1999 while attending Miami University. In 2004 he began racing in the Infiniti Pro Series (now called Industry Lights) and sat on pole in his first series race at Kentucky Speedway. Despite his success in 2005, Gregg did not have a full-time ride in 2006 and participated in 3 races as a substitute driver, a role which he continued to fill in 2007 and 2008, driving in two races in each of those years.