Selected fourth overall in the 1997 NFL Draft from Florida State, Peter Boulware joined the Ravens as a dynamic edge rusher, aimed at energizing a young franchise. Playing alongside Ray Lewis in the front seven, Boulware utilized explosive speed to establish himself as the team's primary edge defender and laid the foundation for the aggressive defenses that came after.

Boulware had a deadly mix of a quick first step, long reach, and smooth corner-turning skills. Mainly playing outside linebacker in 3-4 schemes or rushing as an end in nickel formations, he excelled at beating offensive tackles with speed to the outside before dipping his shoulder to reach the quarterback. His relentless motor also enabled him to pursue plays from behind, making him a quick-impact player in passing situations.

Boulware made a strong start as a rookie in 1997, disrupting backfields to achieve 11.5 sacks. His quick impact earned him the AP NFL Defensive Rookie of the Year award and indicated Baltimore was assembling a formidable defensive squad. He continued his success with 8.5 sacks in 1998, earning his first Pro Bowl, and then recorded 10.0 sacks in 1999, securing a second straight Pro Bowl and Second-Team All-Pro recognition.

In the notable 2000 season, Boulware was a crucial pass-rusher for the legendary defense that set the 16-game record with only 165 points allowed. He recorded 7.0 sacks during the regular season and contributed an additional three in the postseason, helping them secure victory over the New York Giants in Super Bowl XXXV.

Boulware hit his career peak in 2001 with a franchise-record 15.0 sacks, leading the AFC. He continued to be a top edge rusher over the following two seasons, earning Pro Bowl honors in 2002 and 2003, with a total of 15.5 sacks during those years.

Severe knee problems caused him to miss the entire 2004 season. He returned in a limited role in 2005, recording 2.5 sacks, but injuries ultimately ended his career early. Boulware appeared in 126 regular-season games, amassing 70.0 sacks, 401 tackles, and 14 forced fumbles.