David Sims is an experienced executive in the infrastructure and defence sectors. They currently serve as Chief Executive Officer of McMahon Services (2025 - Present) and as a member of the Board of Directors for Wellness in Infrastructure (2023 - Present). Their prior leadership roles include General Manager - Victoria & Tasmania at McConnell Dowell (2020 - 2023) and Chairperson of the Victorian Major Infrastructure Contractors Forum (2017 - 2024). They held a PhD in Physics and a BSc (Hons) from the University of Melbourne, and were a Nuclear Physicist and Lecturer at Lund University (1996 - 1998).
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