[1][2] He then served as head coach at William & Mary Tribe (2006–2012), the Rhode Island Rams (1993–2005)[3][4][5][6] and the Marymount Saints (2014–2021).
Leoni was named the youngest NCAA DI head baseball coach in September, 1992 when he was hired to pilot the Rams at the age of 23.
At the time, the program was a perennial bottom feeder in the Atlantic 10 Conference and slated for Title IX elimination.
After a successful campaign to save the program, all athletic scholarship funding was stripped prior to the 1993-1994 academic year, leading to a dismal 2-39-1 record.
Over the next 11 years, with less than 2.5 full scholarships and no full-time assistant coaches, the Rams were transformed into a conference and regional powerhouse.
Late in August 2005, Leoni began his tenure at the College of William & Mary, replacing former Major Leaguer Jim Farr.
[16] In 2008, the program finished with the second most wins (36) in its history and had a school record four Major League Baseball draft picks.
[19] Leoni was inducted into the Rhode Island Baseball Coaches Association Hall of Fame in 2010, receiving the Ben Mondor Award for lifetime service.
[20] From 2010 to 2011, the Colonial Athletic Association reduced the championship field size to four teams, when the Tribe narrowly missed the playoffs.
[14] In 2012, the team won 31 games, and had the Colonial Athletic Association Pitcher of the Year for the second consecutive season.
[24] The Marymount Saints had 24 freshman and six transfers when it began varsity competition in the Capital Athletic Conference during the 2014 season.
Marymount reached the NCAA DIII High Point Regional Tournament, a first in program history.
Then, in 2024, the Mountaineers advanced to the Metro Atlantic Athletic Conference tournament with a fourth place finish, its first postseason appearance since 2018.