This is a great instructional design infographic produced by Arizona State Univeristy (ASU). Several professionals are involved in the instructional design field. However, the full range of what an instructional designer do may be unknown. A large group of ASU Instructional Designers and Technologists were asked to tell about the work they do and the ASU Instructional Designers Infographic is based on these findings.
I highly encourage you to read the article by clicking Introducing the ASU Instructional Designers