In 1998, Corino debuted in Extreme Championship Wrestling as a heel manager. He stood out in ECW as a result of his "King of Old School" gimmick, where he would deride hardcore wrestlers.
In late 1999, Corino took Jack Victory on as a manager, and became an advisor for Tajiri and Rhino. He then began feuding with Dusty Rhodes, who defeated him in a gory bullrope match at Living Dangerously. At Heat Wave 2000, he lost to Jerry Lynn. Corino went on to win the ECW World Heavyweight Championship on November 5, 2000 at November to Remember by defeating Justin Credible, Sandman and Jerry Lynn in a Double Jeopardy match; then to successfully defend it at Massacre on 34th Street in December against Jerry Lynn and Justin Credible in a three way dance.
Corino left the company on January 7, 2001, the night he lost the ECW World Title at Guilty as Charged 2001 to Sandman.
In November 2016, Corino worked as a guest trainer at the WWE Performance Center. Shortly afterwards, it was reported that he had signed to become a full-time trainer for WWE, starting January 2017. On January 12, 2017, it was confirmed that Corino was now working for WWE.