Gary Mitchell Lavergne (born October 28, 1955) is an American non-fiction author.

[2] He was a social studies teacher, held administrative positions for both the SAT and the ACT.

[2] He worked for the College Board traveling to universities helping administrators understand the SAT.

[2] Lavergne retired as director of admissions research for the University of Texas in 2019.

[3] Among Lavergne's books is 1997's A Sniper in the Tower about the 1966 shooting rampage of Charles Whitman,[4] which according to a 2007 Associated Press article is "considered the definitive account of the massacre"[5] and to Frank Rich in a 1997 The New York Times piece is "the authoritative account of the Whitman case".