What happened: Forst was in the final year of his contract and had no interest in relocating to Las Vegas in two years. He joined the Athletics' front office in 2000.
Why it matters: The change installs new baseball operations leadership days after the Aug. 3 trade deadline. It also separates the club from a longtime executive before its planned 2028 move.
By the numbers: Forst spent 27 years with the organization and had served as general manager since 2015.
What to watch: Feinstein's first roster decisions will come under scrutiny as the Athletics determine their long-term front-office structure.