Chris Gunn, local filmmaker and director of Counseling Services at NAU, will discuss his documentaryChanging Gears: Flagstaff and the Mountain Bike, from noon to 2 p.m. Wednesday and Thursday, Dec. 14 and 15, in the NAU Bookstore.

The documentary captures Flagstaff’s role in the creation and evolution of the mountain bike, and it was selected to be screened at the Flagstaff Mountain Film Festival in October.

Gunn will be on hand to discuss mountain biking in northern Arizona; the film will be available for purchase on DVD.