The St. Louis Cardinals on Monday, Sept. 30 announced that Chaim Bloom will succeed John Mozeliak as president of baseball operations following the 2025 season. Bloom, who is Jewish, has worked for the Cardinals as an advisor since January 2024.

Bloom attended a Jewish day school in his native Philadelphia. He also attended Jack M. Barrack Hebrew Academy (which was then known as Akiba Hebrew Academy), where he graduated in 2000. In a Barrack Hebrew Academy alumni spotlight, Bloom called his time there an important educational experience.

“My years at Akiba were critical to my development, both academically and personally,” Bloom said in the bulletin. “More important than any specific pieces of knowledge that I received was in fact learning how to read, how to parse things, and how to think critically. Akiba also tries to make students aware of how to treat others and of their responsibility as citizens of a larger world, and that’s a mindset that stays with me in my work and my life.”

In 2005, Bloom joined the Tampa Bay Rays as an intern. He began working fulltime for the team in its minor league operations later that year and was promoted to assistant director of the same unit in 2008. In 2014, he was named director of baseball operations of Tampa’s major league team, and senior vice president of baseball operations in 2016.

During his tenure in Tampa Bay, Bloom was credited with creating a competitive, winning team despite working with a lower-tier payroll. He was an early innovator of analytics and the use of shifts.

In 2019, Bloom joined the Boston Red Sox as chief baseball officer, where he inherited another low-payroll team. His first full season in Boston was 2020, which was shortened by Covid. He was fired by Boston after the 2023 season and joined the Cardinals in 2023.

Bill DeWitt II, chairman of the Cardinals, announced that the team has agreed to a five-year contract with Bloom.