[1][2] Seeing little playing time in the NFL, Lorenzen spent his entire career as a backup, although he was part of the Giants team that won Super Bowl XLII.

Lorenzen attended Highlands High School in Fort Thomas, Kentucky, and was a letterman in football, basketball, and baseball.

He also rushed for 904 yards (8.4 average per carry) and 15 TDs in leading Highlands to a 15–0 season[6] and No.19 national ranking as a senior, earning him the Mr. Football Award.

As a redshirt freshman, he was named the team's starting quarterback by Wildcats head coach Hal Mumme ahead of returning starter Dusty Bonner.

[9] Lorenzen's career at Kentucky was marked by two head coaching changes; Mumme departed as an investigation into NCAA rules violations brought down his staff and resulted in the program being placed on probation with scholarship limitations.

After Lorenzen helped lead the team to a 7–5 record in 2002, head coach Guy Morriss left to become the head coach at Baylor University and was replaced by Rich Brooks, who designed plays in which Lorenzen lined up as a receiver while Shane Boyd played quarterback.

[19] This proved to be his final appearance in the NFL, as Manning's injury did not cost him any further playing time and Lorenzen did not see further action in the 2007 season.

[19][20] He continued to serve as Manning's backup for the remainder of the season, which concluded with the Giants winning Super Bowl XLII against the then-undefeated New England Patriots and Lorenzen earning a championship ring.

On March 23, 2010, he was hired as the quarterbacks coach at his alma mater, Highlands High School, in Fort Thomas, Kentucky.

[3] Still wanting to play, Lorenzen quit the UIFL's top job and signed with the Owensboro Rage of the Continental Indoor Football League partway through the 2013 season.

[32] Lorenzen returned to the River Monsters, by this point a member of the Continental Indoor Football League, on December 17, 2013.

Lorenzen's play was filmed and the videos ended up all over the internet, overshadowing the River Monsters' 36–20 victory over the Bluegrass Warhorses.