Lefebvre spent nearly five seasons in Denton from 2006-11 where he primarily served as the men's basketball strength coach. During his first stint with North Texas, Lefebvre got to know current North Texas women's basketball head coach Jalie Mitchell while she was an assistant with the Mean Green.
Prior to returning to North Texas, Lefebvre was the men's basketball strength coach at Louisiana State University. Lefebvre has worked with world class athletes such as 2016 NBA Draft first overall pick Ben Simmons, NCAA national champion and United States Olympian Lolo Jones and NFL linebacker Craig Robertson.
Lefebvre has also worked at UTEP and Marquette.