Alexander Benjamin Katz (born October 12, 1994) is an American-Israeli professional baseball left-handed pitcher who is a free agent.

Katz pitched for the St. John's Red Storm, and was part of the team that won the 2015 Big East Conference Regular Season and Tournament.

[2] Katz went to Herricks High School (Class of 2012) in New Hyde Park, New York, where he pitched and played first base and outfield.

[2][5] Katz then pitched for the St. John's Red Storm, attending the school on a baseball and academic scholarship, while majoring in sports management and minoring in business.

On April 2, 2014, Katz started and struck out five in 6.0 scoreless innings of no-hit ball to earn the win as part of a combined one-hit shutout at Wagner.

[13] Katz was part of the St. John's Red Storm baseball team that won the 2015 Big East Conference Regular Season and Tournament.

On May 20, 2017, the White Sox traded Katz to the Baltimore Orioles in exchange for two international pool signing bonus spots valued at over $750,000.

[16][17] Orioles Executive Vice President Dan Duquette said of Katz: He has a good fastball and excellent strikeout record.

In late 2018, Katz signed a minor league deal to return to the Chicago White Sox organization, but was released during spring training in March 2019.

On April 15, 2019, Katz was signed as a spring training invitee for the Long Island Ducks of the Atlantic League of Professional Baseball.

[24] On April 18, 2022, Katz signed with the Long Island Ducks of the Atlantic League of Professional Baseball.

[26] On March 11, 2024, Katz signed with the Southern Maryland Blue Crabs of the Atlantic League of Professional Baseball.

On May 31, 2024, Katz was traded to the Hagerstown Flying Boxcars of the Atlantic League of Professional Baseball in exchange for Jaylyn Williams.

[30] On July 12, 2024, Katz signed with the Long Island Ducks of the Atlantic League of Professional Baseball.

[39] In October 2018 he became a dual Israeli citizen, partly to help Israel’s baseball team make the 2020 Olympics.

[50] Rob Refsnyder, a New York Yankee at the time, saw the design on an Instagram account, and direct-messaged Katz, asking: "Hey, can my friend Aaron and I send in a bunch of cleats?”[50][49] Refsnyder and a rookie outfielder named Aaron Judge thus became his first major league clients.

[50][49] The company was officially born in August 2019, after Major League Baseball ended its insistence on uniformity in 2018, which had been reflected in its Collective Bargaining Agreement’s Footwear Supplier Regulations “51 percent rule,” which required that players’ cleats mainly display their team’s primary colors.

[50] Among the company's clients, which include athletes and celebrities, in addition to Aaron Judge are Fernando Tatis Jr., Joc Pederson, Jose Altuve, Byron Buxton, Robinson Cano, Tony Gonsolin, Kyle Schwarber, Rafael Devers, William Contreras, Jacob deGrom, Edwin Díaz, Marcelo Mayer, Robbie Ray, and a few hundred major leaguers and minor leaguers; 450 of them in the major leagues.

[51][49][50][47][52][53] Some individual Major League Baseball players have ordered 20 to 30 pairs of cleats in a single season.