He became a partner of Coopers & Lybrand (now PricewaterhouseCoopers) in 1976 and was a member of the council and Executive. In 1990 he joined CGU Insurance Company (SA) Limited, Commercial Union Life Insurance Company Limited and Sentrasure Limited as executive director. Don is currently the chairperson of General Accident Insurance Company (SA) Limited, Insurance Outsourcing Managers Holdings Limited, Renasa Insurance Company and the audit committee of Discovery Health Medical Aid Scheme. He has served on the council of the Institute of Directors (IOD) for a number of years and is currently an active member of the Audit Committee Forum.