Tomsula was an assistant for several years in NFL Europe. He was the defensive line coach for the England Monarchs in 1998 and for the Scottish Claymores from 1999 to 2003. In 2004, he became the defensive coordinator for the Berlin Thunder, a position he held for the 2004 and 2005 seasons. Tomsula became the head coach of the Rhein Fire for the 2006 season.
San Francisco 49ers
Assistant coach
The 49ers hired Tomsula to serve as their Defensive Line Coach during the 2007 season and he remained in that role through the 2014 season. During the 2010 season, Tomsula was named interim head coach for the Week 17 game versus the Arizona Cardinals, after head coach Mike Singletary was fired with one game remaining in the season. He won his first game as 49ers head coach, 38–7 over the Arizona Cardinals. For the 2011 season, incoming new head coach Jim Harbaugh retained Tomsula in his previous position as defensive line coach where he would remain through all four seasons of the Harbaugh era.
Head coach
On January 14, 2015, Tomsula became the 49ers' head coach, succeeding Jim Harbaugh who had been forced out by 49ers CEO Jed York. Tomsula employed new coaching practices, which included giving his players breaks to check social media during meetings, shorter, easier practices, and more days off. The result was one of the worst offenses in team history. Scoring only 238 points, the 49ers would struggle to a 5–11 season, with Colin Kaepernick ending the season on injured reserve after being benched. The 49ers would ultimately be eliminated from postseason contention in Week 14 of the 2015 regular season. Tomsula was fired just a few hours after the 49ers season finale against the St. Louis Rams, which the 49ers won 19–16 in overtime. On January 4, 2016, York confirmed that the 49ers would pay Tomsula $14 million for his one season as head coach.
On January 8, 2020, Tomsula was hired as the defensive line coach for the Dallas Cowboys.
Head coaching record
NFL Europe
NFL
Interim head coach
Personal life
Tomsula's grandfather, James J. Tomsula, was a son of immigrants from Hungary and served in the United States Navy during World War II. He is a devout Roman Catholic, but does not push his views on others, stating that "God takes care of everything...I don't give anyone religion lessons." Tomsula has worked as a medical equipment sales representative, newspaper delivery man, firefighter, night janitor, firewood cutter, department store floor cleaner, food sales representative, and doormat salesman.