This performance featured his outstanding original score, "Endurance," based on Shackleton's attempt to reach the South Pole.

In 2010, Mahr was a clinician for the 50th anniversary of the WELS National Band Festival in Onalaska, WI at Luther High School.

His compositions are often performed by high school and university symphony bands and wind ensembles, but professional groups, such as the Minnesota Symphonic Winds and the United States Air Force Band also perform his works.

Mahr's perhaps most famous work, Dig Down Deep, Grade 3, has been performed and loved by many, including the St. Olaf Band.

He is married to Jill Mahr, music performer and educator, and they have two children, Jenna and Heron.