Bill Carollo worked as an NFL official for 20 years, spending the last 12 years as a referee. Bill officiated in two Super Bowls and eight Conference Championship games in his career. He also served as director of the NFL Referees Association, the union representing officials, from 2001-2006. He is currently the coordinator of officials for Big Ten Conference football where he oversees all the officials. Early in his career, Bill officiated Big Ten football games for 10 years, was a basketball referee seven seasons, and worked as the official scorer for the Milwaukee Brewers.

Widely known as one of intercollegiate sports' most successful undertakings, the Big Ten boasts a lineage of legendary names and an ongoing tradition of developing strong leaders. The conference established itself as the preeminent collection of institutions in the nation, where the pursuit of academic excellence prevailed as the definitive goal of all Big Ten universities.