Billings joined the University of Memphis defensive staff in 2012. In his first season at Memphis, Billings coached the defensive line. In 2012, Memphis led the league in total defense in conference games and in 2013 Memphis was ranked in the top 20 conference defensive rush. Prior to Memphis, Billings oversaw the Wake Forest wide receivers during the 2006 and 2007 seasons and then supervised the secondary in 2008 and 2009. He worked with the defensive ends in 2010 and coached the outside linebackers while being co-defensive coordinator in 2011.
Billings was head coach at Southeast Missouri in Cape Girardeau, Mo., for six years (2000-05). He was named the Ohio Valley Conference (OVC) Coach of the Year and the American Football Coaches Association (AFCA) Region 3 Coach of the Year.
Before taking over at Southeast Missouri, Billings spend 10 years as an assistant coach at Marshall from 1990-99. During his tenure, Marshall was the winningest program in college football, compiling a 114-25 record. Billings served as the Thundering Herd's defensive coordinator during his final season in 1999. That year, Marshall completed a perfect 13-0 campaign and was ranked No. 10 in the final national polls. The Herd won-Mid American Conference (MAC) titles in each of Billings' final three seasons at Marshall.
Prior to taking the defensive coordinator role, Billings worked primarily with the Thundering Herd special teams.
Billings began his collegiate coaching career as a Missouri graduate assistant under Warren Powers in 1983-84. The 1984 Tigers played in the Holiday Bowl. He moved on to Oklahoma as a graduate assistant coach under Barry Switzer for the 1985 and 1986 seasons. The Sooners played in the 1985 and 1986 Orange Bowls, winning the 1985 national championship. Billings returned to Missouri for the 1987-89 seasons.
A native of Honey Grove, Texas, Billings began his coaching career as a secondary coach in Duncan (Okla.) High School in 1980. He served as head coach at Prairieland High School in Pattonville, Texas, in 1981 and was secondary coach at Norman (Okla.) High School in 1982 and 1983.
A 1980 Southeastern Oklahoma State University graduate with a degree in physical education, Billings was an all-conference defensive back for the Savage Storm. Billings also played basketball for one season at Grayson County Junior College in Sherman, Texas. He and his wife, Lisa, have two children, Taylor Kay and Trenton Wade.