He has previously played in MLB for the Colorado Rockies, Chicago White Sox, New York Yankees, and Los Angeles Dodgers.

As member of the Fighting Knights, Kahnle won the 2009 Division II College World Series and was named the Most Outstanding Player of the tournament.

[2][3][4] The New York Yankees selected Kahnle in the fifth round of the 2010 Major League Baseball draft.

[13] In his first season with the White Sox, Kahnle had a 2.63 ERA with 25 strikeouts and 21 walks in 27+1⁄3 innings pitched.

[14] On July 18, 2017, the White Sox traded Kahnle, Todd Frazier, and David Robertson to the New York Yankees for Blake Rutherford, Tyler Clippard, Ian Clarkin, and Tito Polo.

On June 4, 2018, the Yankees optioned Kahnle to their Triple-A affiliate, the Scranton/Wilkes-Barre RailRiders, as Adam Warren was activated from the 10-day disabled list.

[17] On July 31, 2020, Kahnle had an MRI that revealed a damaged ulnar collateral ligament of the elbow.

[28] Kahnle made 42 appearances for the Yankees during the 2023 campaign, accumulating a 1-3 record and 2.66 ERA with 48 strikeouts and 2 saves across 40+2⁄3 innings pitched.

[30] Kahnle made 50 relief appearances for New York, registering a 2.11 ERA with 46 strikeouts across 42+2⁄3 innings of work.