The Marlins recalled Kempner from Triple-A Jacksonville on Friday, Christina De Nicola of MLB.com reports.
Kempner was sent down last month despite logging nine scoreless innings with a 10:2 K:BB in six relief appearances. The 25-year-old will likely fill a middle relief role, but his stay in the majors could be brief as the Marlins will need a spot next week for a fifth starter, expected to be Janson Junk (shin).