In 1994, Gillett accepted a post with Toolbox Creative Services and was employed there until 1998 when he became a full-time faculty member at BYU. Prior to his appointment, Gillett had taught part-time at both BYU and the University of Utah. He also served as the department Rank & Status Committee Chair and Futures Committee Co-chair at BYU. In 2005, Gillett and his BFA Graphic Design students were chosen to create the 2005 Utah Arts Festival identity and marketing materials after competing against several local design firms.
His work is regularly featured in national and international design publications including Communication Arts, Creative Quarterly, Graphis, NY Art Director’s Club, and The One Show. His commissioned work has included many Fortune 500 companies.
In 2008, Gillett and fellow professors, Brent Barson and Linda Sullivan, oversaw fifteen students’ creation of the Typophile Film Festival for Opening Credits design package. The work, which was commissioned through alumnus Jared Benson for his companies Punchcut and Typophile.com, has been awarded prestigious design awards. It received a Silver Cube from the Art Directors Club Awards, a Silver Pencil from the OneShow Awards and was selected as a finalist in the Motion Graphics category in the 2008 Adobe Design Achievements Awards.
In 2014, Gillett was featured in Creative Quarterly as a winner in the Professional Fine Art Category. The same year, he initiated the Ultra Violet project funded by the Laycock Center with fellow professors Heather B. Jensen and Mark Graham. The project included many students and faculty of various departments at BYU, and produced several collaborative projects with the artist Ultra Violet (Isabelle Collin-Dufresne). The end of the project came with the showing of "Ultra Violet: The Studio Recreated, April 24-May 24," an exhibition which transported all the contents of her art studio inside Dillon Gallery in New York, including animations the artist had created with BYU students.
Gillett became the chair of BYU's new Department of Design in 2015 when the Department of Visual Arts split to become the Department of Art and the Department of Design. The same year, he received a couple Merit Awards at the 2015 Graphis New Talent Annual as a faculty advisor.