Stephanie DeFeo was named Mercer Softball Co-Head coach in July 2013.
In 2015, DeFeo helped usher the Bears' program into the Southern Conference, taking the program to the brink of a league title in its inaugural season in the conference. Mercer compiled a 37-22 overall record and a 10-7 mark in the league, which included a series victory over SoCon heavyweight Chattanooga at Sikes Field. The Bears carried that success to the 2015 SoCon Championship game, using three shutout victories to come within two runs of a NCAA Tournament appearance.
In 2014, DeFeo helped lead Mercer in its breakout year, as the Bears tallied a 39-19 record and 18-8 mark in league play in their final year in the Atlantic Sun Conference. The Bears finished 21-5 at Sikes Field, while also compiling an 8-2 record in neutral contests. Mercer also finished the season with an RPI ranking of 40, which is the highest in program history.
Mercer played its best softball late in the year, as the team won nine of its last 11 contests. That momentum carried into the A-Sun Tournament with the fourth-seeded Bears upsetting top-seeded USC Upstate before advancing to the program's first conference championship game appearance since 2009.
DeFeo came to Macon by way of Purdue, where she was an assistant coach for the 2012-13 season. Prior to her time with the Boilermakers, DeFeo worked for six years as an assistant and associate head coach at Ball State in the Mid-American Conference. Ball State was 204-145 during her time there, including three conference championships.
Before Ball State, she was a head coach for a brief period. For two years (2001-2002) she was the head coach of East Tennessee State and compiled an overall record of 39-67. Before that, she completed stints as an assistant at Texas-San Antonio (1998-99) and Buffalo (1999-2000). DeFeo began her coaching career as an assistant coach at Southeastern Louisiana in 1997.
DeFeo was a three-time All-American at Louisiana-Lafayette (1993-1997), while playing first base and designated player. She set school records at Louisiana-Lafayette for single-season home runs (15) as well as career home runs (43), slugging percentage (.676) and RBI (187). She earned a bachelor's degree in criminal justice from Lafayette in 1997.
After completing her collegiate playing career, DeFeo played for the Orlando Wahoos in the Women's Professional Softball League in the summer of 1997 and played for the Durham Dragons in the summers of 1998 and 1999.