The description of the self-defined expert instructional technologist is unclear. Technologists in the field are identified in various ways. To determine the characteristics and competencies of self-defined expert instructional technologists, an interpretive field study consisting of interviews was conducted. The results revealed three core characteristics and three core competencies that are inherent in all experts, including expert instructional technologists. Continuous informal learning is required for expert sustainability. Experience, prior knowledge, and practice create a cycle of involvement that keeps the instructional technologist current with technology and design strategies. A framework for expertise can assist novices and experts in assessing their current level of domain knowledge. [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://bibliotheek.ehb.be:2222/en-US/products/dissertations/individuals.shtml.]