David Williamson is Deputy Secretary of the Department of the Prime Minister and Cabinet and APS Review Secretariat.

David commenced in the Australian Public Service as a graduate in 2000, and joined the Senior Executive Service in 2004. He is currently Deputy Secretary of the Department of the Prime Minister and Cabinet, leading the team supporting the Independent Review of the APS.

Prior to this (2016-18) he was a Deputy Secretary and Innovation Champion in the Department of Agriculture and Water Resources, where his group included agricultural policy, farm support and sustainable agriculture, fisheries and forestry divisions.