Hon Stephen Mullighan GAICD | Principal
Stephen is a strategic and outcomes-focused senior leader with extensive executive experience across the public and private sectors.
His expertise spans governance, financial stewardship, economic policy, regulated markets, crisis and risk management, and the delivery of major infrastructure programs. He has a strong record of restoring fiscal sustainability, supporting economic growth and navigating complex stakeholder environments.
An accomplished public communicator, Stephen brings extensive media and stakeholder engagement experience, together with trusted relationships across government, industry and the community.
Highlights
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Led the state’s economic, budget and financial strategy, overseeing the management of multi‑billion‑dollar public sector finances and investment programs.
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Positioned South Australia as a leading jurisdiction in defence and space programs, driving investment, jobs, and sovereign capability.
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Oversaw one of the largest infrastructure programs in the state’s history across road, rail, and public transport, including policy reforms for heavy vehicle access, rideshare regulation, cycling infrastructure, balancing safety, competition, and community expectations.
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Provided strategic, financial, and policy advice to Deloitte's public sector and corporate clients on economic development, infrastructure, and organisational performance.
Key roles
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Treasurer of South Australia | March 2022 – September 2025
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Minister for Defence and Space Industries | April 2024 – September 2025
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Minister for Police | January 2025 – September 2025
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Minister for Transport and Infrastructure | March 2014 – March 2018
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Minister for Housing and Urban Development | January 2016 – March 2018
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Member of the House of Assembly, Parliament of South Australia | Member for Lee | March 2014 – March 2026 | Three consecutive terms.
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Associate Director, Deloitte | 2010 – 2013
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Chief of Staff to the Deputy Premier and Treasurer of South Australia | 2007 – 2010
Key speeches
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Announcement of resignation from the South Australian Parliament | 18 September 2025
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Valedictory speech to the South Australian Parliament | 26 November 2025
Qualifications
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Graduate, Australian Institute of Company Directors (GAICD) Australian Institute of Company Directors | 2026
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Bachelor of Arts (Public Policy) University of Adelaide | 2001