The exact staff duties and approval by the LSU Board of Supervisors is still pending for both coaches.
Prior to joining Jones at North Texas, Forrest spent six seasons at Arkansas State, where he also served part of the 2007-08 season as interim head coach.
In his four years at North Texas, Forrest played a key role in recruiting several of the players who helped make a six-year run of averaging 21 wins possible, including Tony Mitchell, the 6-foot-8 forward who this past year was named the Sun Belt's Freshman of the Year and also a first-team all-conference selection.
A native of Little Rock, Forrest also played a lead role in recruiting several other top players from the Dallas-Fort Worth area, including Dallas Kimball forward Jordan Williams.
"Shawn Forrest will be a tremendous addition to the LSU Tiger family," Jones said in a statement released by LSU. "With his ability to recruit and identify players on the recruiting front will be valuable to this program. Shawn's ability to develop relationships and maintain them will be essential in the recruiting efforts here at LSU. He is a tremendous basketball coach as well with a great feel for the game that will also prove valuable for us moving forward."
A former basketball star at Arkansas-Pine Bluff, Forrest also spent time at Florida A&M and Troy State (1998-01).
Leonard comes to LSU with a varied background, including his 11 years as a member of the Mean Green coaching staff. It was Jones who selected Leonard to join his staff in Memphis during the 1999-2000 season. It marked a return to college basketball for Leonard, who at that time was the owner of an advertising and consulting firm in Memphis.
Among Leonard's duties at UNT was to handle the program's scouting department, compiling and updating reports on each team North Texas played throughout the season. He also assisted in game and practice coaching duties and coordinated team travel and the planning and organization of the Johnny Jones Basketball Camps each summer.
"Charlie Leonard has been with me for 12 years and has done a tremendous job assisting us in different areas. He is a great on-the-floor basketball coach and he has a tremendous basketball mind. We look forward to the impact that he will have on this LSU basketball program."
Leonard's experience in coaching basketball originally dates back to 1975 when he started a career that began at Memphis (Tenn.) Prep school and includes a 12-year tenure at Christian Brothers High School. Later, he served for seven seasons heading the program at Christian Brothers University.
Leonard was a two-time NAIA District 24 Coach of the Year at CBU and was the school's second winningest coach with 137 victories. The Buccaneers had six consecutive winning seasons and had 20 or more wins three consecutive years during Leonard's 1990-97 tenure.
At Christian Brothers High School, he won a state championship in 1987 and sent 28 of his players on to play college basketball.
Leonard graduated from Christian Brothers University in 1975.