Romberg attended the University of Miami, where he played for the Miami Hurricanes football team from 1999 to 2002.
He was signed by the Jacksonville Jaguars as an undrafted free agent in 2003, and has also played for the Saint Louis Rams. He is currently a free agent
He started his football career in the ninth grade playing for the Belle River District High School football team Romberg never allowed a quarterback sack at center and was part of an offensive line that helped produce three 1,000-yard rushers (James Jackson, Clinton Portis and Willis McGahee), a quarterback (Ken Dorsey) who set every major Hurricanes career passing record and an offense that averaged more than 465 yards per game for the balance of his three years as the starting center.
After a stint with the Jacksonville Jaguars, Romberg became the starting center for the Saint Louis Rams for a brief time in 2006 and 2007, replacing an injured Andy McCollum, but he was replaced in 2009 by Jason Brown.
In 2009, Romberg was a reserve offensive lineman for the Atlanta Falcons. He was released by the Falcons on September 4, 2010.
Due to an injury to starting center Todd McClure, the Falcons re-signed Romberg on August 30, 2011. However, he was released during final cuts on September 3 to avoid a guaranteed contract, but was re-signed on September 12 where he remained on the active roster for the remainder of the 2011 season.
Brett finally retired in 2012 from the National Football League.
Brett was inducted into the University of Miami Sports Hall of Fame in March 2013 for the sport of Football.