He pitched for UC San Diego Tritons and Cypress College, leading them to the 2013 CCCAA state title.
Leichman was born and grew up in kibbutz Gezer, Israel, about halfway between Jerusalem and Tel Aviv.
[13] Leichman competed for Israel during the qualifying round of the 2012 European Baseball Championship, in 2011, and was the designated hitter in all five games.
[16] In the first game of the home/away finals against Great Britain, Leichman hit a double in four at bats with a walk and scored two runs.
[19] Leichman's only appearance in the B-Level qualifier in 2015 was in the second game, against Poland, where he pitched 8 innings while giving up four earned runs, on eight hits, and struck out 5.
He started one game as the team played in the 2019 European Baseball Championship - B-Pool in early July 2019 in Blagoevgrad, Bulgaria, winning all of its games and advancing to the playoffs against Team Lithuania in the 2019 Playoff Series at the end of July 2019 for the last qualifying spot for the 2019 European Baseball Championship.
[3] Leichman needed Tommy John surgery to repair a torn ulnar collateral ligament in his elbow, was out for all of the 2011 season, and pitched only 11+1⁄3 innings during 2012.
[3] Leichman came back in 2013 to aid the Chargers to a State Championship, logging a 1.42 ERA over 31+2⁄3 innings, highlighted by a complete-game shutout in a spot start to win the super regional.
[31] He served as a pitching coach for the Yarmouth–Dennis Red Sox in the collegiate summer Cape Cod Baseball League,[32][33] which won the 2016 championship.
[34] Six months after graduating from college, Leichman was Coordinator of Organizational Learning for the Seattle Mariners' player development program in 2017, supporting the organization's minor league managers and coaches.
[37][38] In 2019, Leichman was the pitching coach of the West Virginia Power, a Class A affiliate of the Seattle Mariners in the South Atlantic League.
[39][40] In 2020 and 2021, Leichman was the pitching coach of the Arkansas Travelers, a Class AA affiliate of the Seattle Mariners in the Double-A Central.
[44] In December 2022, at 33 years of age, Leichman was named the assistant pitching coach of the Cincinnati Reds in Major League Baseball.