Twenty years after Theo Epstein delivered the Red Sox a World Series title that had been so elusive, he’s back in Boston as a part owner. Epstein has joined Fenway Sports Group, the parent company of the Red Sox, as a senior adviser, the company announced in February 2024. The role comes with an ownership interest in FSG, giving Epstein a hand in ventures across FSG’s umbrella, including Liverpool, the Pittsburgh Penguins, RFK Racing and Boston Common Golf. The size of Epstein’s ownership stake and investment were not announced. Epstein famously grew up a Red Sox fan in Brookline, Mass. John Henry’s ownership group, then new on the scene, hired Epstein ahead of the 2003 season, and in year two, Epstein’s roster gave the Sox their first World Series title since 1918 — still one of baseball’s brightest moments this century. Epstein won one more title with the Red Sox in 2007 before a messy collapse in 2011 led to his exit to Chicago. He helped the Cubs break their own extended title drought in 2016. After stepping away from the Cubs, Epstein had been interested in pursuing an ownership opportunity in baseball. He went to work for the commissioner’s office for a time, a job he is now relinquishing, although he will continue to work with the league’s competition committee on an “informal basis,” per the news release. Epstein was previously working with a private equity group that had ownership interest in FSG, Arctos Partners. Epstein will remain in his role with that company.