Athletic director Barry Collier announced that the accelerated timetable to transition to the Atlantic 10 was made possibly only with cooperation from both leagues. Virginia Commonwealth is also entering the league in men's college basketball, with the A10 ballooning to 16 teams.
"We are grateful to the Atlantic 10 for welcoming us into the fold a year ahead of schedule," Collier said. "Since announcing our intention to depart after 2012-13, Butler and the Horizon League have discussed the terms for next season. Ultimately, it was in our best interest to reach an agreement with the Horizon League for immediate departure."
Butler is joining the conference for all sports, including men's and women's soccer and cross country this fall.