Dr. Mabry has been the director of the Nashville Symphony Chorus since 1998 and is professor emeritus of music at Austin Peay State University in Clarksville, Tennessee. He served as director of its Center for the Creative Arts and director of choral activities at the university until his retirement in 2003.
While at Austin Peay, Mabry's choirs performed for national and regional conventions of the Music Educators National Conference and the American Choral Directors Association. A native Tennessean, he holds a bachelor's degree from Florida State University and Master of Music and Doctor of Philosophy degrees from George Peabody College for Teachers at Vanderbilt University. Mabry is active as a choral clinician and festival adjudicator. He has conducted All‑State choirs in Kentucky and Virginia.
Mabry is a published composer and arranger. In addition to his choral and instrumental compositions, he has written and produced musical shows for entertainment parks around the country. He was formerly director of entertainment for Opryland U.S.A. in Nashville. While at Opryland, his musical shows toured the Soviet Union under the auspices of the U.S. State Department and appeared three times for the President of the United States at the White House.
In 1983, Mabry was honored as the first Austin Peay faculty member to receive both the Distinguished Professor Award and the Richard M. Hawkins Award for Scholarly and Creative Achievement. In 2003, he received the Governor's Award in the Arts for Arts Leadership in Tennessee and the Spirit of Tennessee Award from the Tennessee Arts Academy.