Prior to serving with the Baltimore Ravens, Roman was an assistant coach for the Buffalo Bills, San Francisco 49ers, Houston Texans and Carolina Panthers.

[1] At age 10, with his family strapped for cash, Roman got his first job as a paperboy for the Atlantic City newspaper The Press; during the summers he worked as a "runner" on the beaches of South Jersey.

He earned All-Ohio Athletic Conference honorable mention status following his senior season in which he recorded 80 tackles and six sacks.

That year the Blue Streaks defense allowed a league-low 98 points in 10 games and enabled the John Carroll University football team to capture a share of the OAC championship.

[5] In 2008, Roman returned to his alma mater and served as the offensive coordinator at Holy Spirit High School.

When Harbaugh left Stanford in 2011 to become head coach of the San Francisco 49ers, Roman followed and was named the offensive coordinator.

On February 8, 2024, Roman was named as offensive coordinator for the Los Angeles Chargers under head coach Jim Harbaugh.