Romanowski went on to a 16-year career in the NFL, playing for the San Francisco 49ers, Philadelphia Eagles, Denver Broncos, and Oakland Raiders. After his career, he was listed by ESPN as the fifth dirtiest player in professional team sports history. Romanowski played 243 consecutive games during the 1988-2003 seasons, an NFL record that stood until Chris Gardocki broke it during the 2006 season, finishing his career with 265,. He won 4 Super Bowl Championships, and played 5 Super Bowls. During his 16-year career, Romanowski compiled 1,105 tackles, 39.5 sacks, 18 forced fumbles, and 18 interceptions, which he returned for a net total of 98 yards and 1 career touchdown. Romanowski was a Pro Bowl selection twice, in 1996 and 1998, both during his tenure with the Denver Broncos.
Altercations
Romanowski was involved in numerous altercations with both teammates and opponents. In 1995, while with the Eagles, he was ejected from a game — and subsequently fined $4,500 — for kicking Arizona Cardinals fullback Larry Centers in the head. Two more incidents occurred during the 1997 season while he played for the Broncos. In the first, he was fined $20,000 after a helmet-to-helmet hit on then-Carolina Panthers quarterback Kerry Collins in a preseason game resulting in Collins sustaining a broken jaw. In the second incident, Romanowski spat in the face of 49ers wide receiver J. J. Stokes in a regular-season game played in December on a Monday night in response to Stokes' taunting. Two years later, while still with the Broncos, he was fined a total of $42,500 for three illegal hits plus a punch thrown at Kansas City Chiefs tight end Tony Gonzalez, and was also fined an undisclosed amount for throwing a football at Bryan Cox of the New York Jets, the ball hitting him in the crotch area.
In 2003, Romanowski attacked and injured one of his teammates, Marcus Williams, during a scrimmage. Williams, a backup tight end for the Oakland Raiders, was forced to retire after Romanowski confronted Williams after a play, ripped off his helmet, and crushed his eye socket with a punch. Williams sued for damages of $3.4 million, arguing that Romanowski had been suffering from "roid rage" when he attacked him. Williams was awarded $340,000 for lost wages and medical expenses by a jury. Williams was quoted as saying he and his lawyers "just wanted to prove what was right and wrong about football". Williams's attorney said he was very pleased with the verdict.
Racism allegations
Romanowski has been accused of being racist at many points during his career and after retirement. Various media critics have pointed to his fines for actions including kicking Larry Centers in the head in 1995, spitting on San Francisco 49er receiver J.J. Stokes in 1997, and ripping Eddie George's helmet off in 2002, as evidence. Romanowski called Carolina Panthers starting quarterback Cam Newton "boy" in a tweet after Newton's team lost in Super Bowl 50 and Newton conducted a very brief press interview. He later apologized after he was accused of being racist.
Post-NFL career
Romanowski co-authored an autobiography in 2005 titled Romo My Life on the Edge: Living Dreams and Slaying Dragons. The book became a New York Times best-selling book in 2005. It chronicles his childhood, college career, NFL career, living with post-concussion symptoms, nutrition, and recovery techniques used during his NFL playing career. He was featured on the cover of the Midway Games title and adds his voice as Bruno Battaglia, a linebacker in the game who wears his 53. He also appears in NCAA Football Series indirectly as LB #53 for the 1984 Boston College Eagles. In 2006, he founded Nutrition53, a nutritional supplement company. He was also a minority owner of NASCAR's Swan Racing in 2013; Nutrition53 sponsored the team in 10 races that year.
Football
In 2008, Romanowski was the defensive coordinator for the Piedmont High School Highlanders Freshman Football team, where his son played. In January 2009, Romanowski threw his name into the search for Mike Shanahan's replacement as the head coach of the Denver Broncos. Romanowski sent a 30-page PowerPoint presentation to team owner Pat Bowlen, but was not considered for the job. The job was ultimately given to Josh McDaniels.
BALCO Scandal
Romanowski and his wife were investigated for prescription drug fraud, though the charges were later dropped. Records seized by the government belonging to the Bay Area Laboratory Co-operative, later discovered to be the source of a designer steroid, indicate that he had used the anabolic steroid "The Clear" and synthetic testosterone ointment "The Cream" provided by BALCO since 2003. Romanowski admitted to staying a step ahead of NFL drug testing policies. In an October 16, 2005 appearance on 60 Minutes, Romanowski admitted to using steroids and human growth hormone that he received from Victor Conte, BALCO owner.
