Hirtle Callaghan & Co. sponsor Theodore Olson lecture by Meaghan Wilby on July 27, 2017 share Hirtle Callaghan & Co. is sponsoring the 10:45 a.m. lecture Friday in the Amphitheater. Friday's morning lecture features Theodore B. Olson, who was the solicitor general for the United States from 2001 to 2004. Olson