After receiving his doctorate, Gary served on the faculty in the School of Music at Northern Arizona University in Flagstaff for four years. During his tenure, assignments included conducting the Women's Chorale, Men's Chorale, Chamber Choir, and Vocal Jazz Ensemble in various years. Dr. Weidenaar also taught undergraduate conducting and methods, and taught in the summer Masters in Music Education program. In 2004-2005, he served as both Interim Music Education Coordinator and Summer Masters Coordinator. Weidenaar also was responsible for planning and hosting the Jazz/Madrigal Festival, which attracted some 115 choirs from over 75 schools annually. Over 100 student workers assisted in the running of the festival, held at 5 sites simultaneously.
Dr. Weidenaar is active as a guest conductor and adjudicator, having served as adjudicator or clinician for over 200 choirs during his four years in Arizona. He has accompanied honor choirs in Belgium and Germany and guest-conducted groups in Arizona, Kansas, and Nevada. In 2007, Gary was invited by the Clarke County School District Las Vegas to be the sole presenter at their spring faculty development day.
Gary is a member of the VoiceCare Network, the Music Educators National Conference (MENC), and a life member of the American Choral Directors Association (ACDA), He served on the Arizona ACDA board as the Repertoire & Standards Chair of Youth and Student Activities for 4 years and is currently the Youth & Student Activities Chair for the Northwest Division of ACDA. He is also a member of the Intercollegiate Men's Chorus (IMC) national board. In February, 2007, he served as logistical coordinator for one of the two performance sites at the 2007 national ACDA convention in Miami, Florida.
In October, CWU students participated in the National Association of Teachers of Singing (NATS) InlaCelebrate A Cool Yule With CWU’s Jazz Nutcracker
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