[2] Carollo worked as an international account executive for 30 years at IBM before becoming Vice President of Global Sales for Milwaukee, Wisconsin based Manpower Inc.[7] Carollo began his officiating career working Wisconsin high school football, basketball, and baseball games.

[7] For a period of time, he also served as the Milwaukee Brewers Official Scorer for the American League.

[8] Carollo started in the NFL as a side judge and officiated Super Bowl XXX in 1996 at that position, then became a referee (crew chief) for the start of the 1997 NFL season after Red Cashion and Howard Roe announced their retirements.

The play consisted of Bert Emanuel making what was ruled a catch at St. Louis' 22-yard line with 47 seconds left in the game and the Buccaneers down by 5.

This led to the NFL clarifying the definitions of both a catch and an incomplete pass, as to avoid this scenario replaying itself in the future.

He was the center of the negotiations that took place during the 2001 NFL season where there was a work stoppage by game officials.

[4] His final assignment was for the AFC Championship game between the Pittsburgh Steelers and the Baltimore Ravens on January 18, 2009.