Dynamic Aon leader will build on Aon's Innovation at Scale strategy to deliver new sources of value to clients CHICAGO, Nov. 22, 2021 /PRNewswire/ Aon plc (NYSE: AON), a leading global professional services firm, today announced the appointment of Jillian Slyfield as the firm's Chief Innovation Officer, effective Dec. 1, 2021. Slyfield, who is based in San.