Season 3 Edit
Tony was formerly an employee at the Stamford branch and was transferred to Scranton. After claiming he didn't feel comfortable with Michael's management style, Tony quit, but Michael insisted that Dunder Mifflin doesn't employ quitters, and instead fired Tony. As a result of this, the company was forced to pay him severance.
Season 5 Edit
He was mentioned by Michael in the 15th episode of Season 5. Michael wanted to put a closure on their relationship as he was mean to him. But in his way back to Scranton with Pam, Michael calls him 'fat' all over again.