Gary is in his 27th year as a choral director and voice teacher at UTSA. Prior to that he taught on the music faculties of Montana State University and Abilene Christian University. He served as Artistic Director and Conductor of the San Antonio Choral Society from 1993 to 2006. For several years, he was the Chorus Master of the San Antonio Opera. Gary has also served on the Executive Board of the Texas Choral Directors Association from 2012 to 2014 as Church Division Vice President. For seven summers he taught choral and vocal music at the Interlochen Arts Camp in Michigan and has been involved in church music leadership for 48 years in congregations of the Church of Christ, the United Methodist Church, the Lutheran Church, the Christian Church, and the Presbyterian Church in Texas, Colorado, and Montana. For the past 10 years, he has served as Music Director for Travis Park United Methodist Church in San Antonio.

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Gary received his Bachelor of Music Education degree from Abilene Christian University, a Master of Music degree in Conducting from Hardin-Simmons University, and a Doctor of Musical Arts degree in Voice Performance and Pedagogy from the University of Colorado, Boulder.