 In his first year with the Maple Leafs' American Hockey League (AHL) affiliate, the Toronto Marlies, he won the AHL rookie scoring title, finishing the regular season with 21 goals and 40 assists.Brown played for the Marlies until his call-up to the Maple Leafs in March 2016.Brown almost made the Maple Leafs' NHL roster out of training camp for the 2015–16 season, but was assigned to the AHL to further his development.