As a senior, he earned All-Area, All-East Penn Conference, and All-State honors, and was named the Defensive Most Valuable Player in the 1997 Kaylee Rotary Bowl.

He was also a Prep Star All-American and a Big 33 selection in 1998, his senior season, in which he recorded 10 sacks on defense and scored eight touchdowns on offense.

After spending his freshman season in 1999 as a reserve, Koppen closed out his sophomore year in the 2000 season with Second-team All-Big East Conference honors, was named to the Rimington Trophy watch list in 2001, and started every game at center and was named a Second-team All-Big East Conference selection for a second time in 2001.

But, following a season-ending injury to starting guard Mike Compton, the Patriots moved Woody to offensive guard and Koppen started the remainder of the 2003 season at center, including in the Patriots' Super Bowl XXXVIII win over the Carolina Panthers.

Following the season, Woody signed with the Detroit Lions, leaving Koppen as the Patriots' starting center.

[7] Two weeks after being released by the Patriots, on September 10, 2012, Koppen agreed to a one-year deal with the Denver Broncos.

[8] On July 28, 2013, Koppen suffered a torn ACL during training camp and missed the entire 2013 season.

[9] Koppen announced his NFL retirement following the 2013 season and was hired as an analyst for NBC Sports Boston.

[10] In March 2014, Koppen was hired as assistant football coach at Bishop Hendricken High School in Warwick, Rhode Island.

In February 2025, Koppen was hired as the football head coach at La Salle Academy in Providence, Rhode Island.