He was also named a Great Northwest Athletic Conference (GNAC) all-star four times as a placekicker and twice as a punter.

He went on to edge out veteran punter Toby Gowin, who had also signed a free agent deal that offseason, for the starting job with the Falcons.

Since regular placekicker Todd Peterson's range was insufficient to attempt a field goal from that distance, Falcons head coach Jim Mora turned to Koenen.

Prior to the initial snap, Patriots linebacker Mike Vrabel called a timeout.

In the Falcons' first preseason game of 2006, Koenen made four field goals, from 53, 50, 40, and 45 yards, along with doing the punting and kickoff duties.

Koenen was slated to do the placekicking, punting, and kickoffs for the Falcons, something that is rarely done in the NFL by one player;[2] however after he converted only two of eight field goal attempts to start the regular season, the Falcons brought back Morten Andersen, who had kicked in Super Bowl XXXIII for Atlanta eight years earlier, to take over field goal duties.

For the 2007 season, Koenen returned solely as the Falcons' punter; the club signed Billy Cundiff to handle the other kicking duties.

A restricted free agent in the 2008 offseason, Koenen was tendered a one-year, $1.417 million contract by the Falcons.

An attempt to return to the NFL in 2016 was aborted due to complications from colitis that he claims was contracted after drinking contaminated water in Tampa.