He played in Major League Baseball (MLB) for the Miami Marlins from 2015 to 2019 and the Tampa Bay Rays in 2021.

[citation needed] On April 29, 2016, Conley was pulled while pitching a no-hitter against the Milwaukee Brewers on the road with two outs in the eighth inning.

[citation needed] Conley was initially a promising starter in the Marlins’ rotation shortly after his major league debut during the 2015–16 season.

Conley then ran into some struggles which proved to be career-damaging, such as several injuries, inconsistent and erratic play, and overall worsening statistics, amongst other issues.

On December 12, 2020, Conley signed with the Tohoku Rakuten Golden Eagles of Nippon Professional Baseball for the 2021 season.

Conley was instructed by the organization to report to Japan for Spring Training alone, with his wife and children to follow once border restrictions lifted.

Conley refused to relocate to Japan or report for Spring Training without his family for any period of time.

[14] On May 10, 2021, Conley signed a minor league contract with the Tampa Bay Rays, and was assigned to the Triple-A Durham Bulls.

[16] Conley would make 17 appearances out of the bullpen for Tampa Bay, posting a 2.29 ERA with 16 strikeouts in 19.2 innings pitched.

[33][34] Adam is an outspoken follower of the Baptist Christian faith,[35] and he and his wife are supporters of the United States Republican Party.