Professor Ken Sumac is a relatively young Rinjoh University scholar, only 34 years old. While he is listed as a professor of pokemon ecology, he seems to spend a significantly greater portion of his time making media appearances then actually producing research. His hair, teeth and clothes are always immaculate, and while he may not be highly regarded in academic circles, he is probably the most famous professor in Rinjoh, thanks to his weekly radio show, television series and his numerous public appearances as an "expert" on pokemon classification, behaviour and habitat.

Professor Sumac is the elder brother of police detective David Sumac.