The purpose of this qualitative study was to develop an initial formal ontology of competencies needed by instructional design professionals in higher education. The ontology was constructed using the domain ontology design process. The initial ontology was then validated by eight expert instructional design professionals in higher education using an online survey. The quantitative responses were analyzed using descriptive statics to describe general trends in data while constant comparative coding method was used to identify themes in the data. Three themes emerged from the study: an expansion of instructional design competencies; the addition of a diversity, equity, and inclusion competency; and the removal of the programming competency. The findings are discussed and proposed changes to the ontology are provided. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://www.proquest.com/en-US/products/dissertations/individuals.shtml.]