Siobhan Osullivan

Background

About Siobhan Osullivan

I am an accomplished executive leader with over 25 years’ experience driving organisational transformation across finance, logistics, and the technology sector. Most recently, I served as Chief Operating Officer and Interim CEO at the Australian Computer Society (ACS), where I led national initiatives in digital capability, workforce reform, and innovation ecosystem operational strategy. At ACS, I have played a key role in shaping the organisation’s future direction, supporting industry and government to navigate complex challenges, from migration assessment, strategic workforce transitions, cyber professionalization and VET accreditation reform. My leadership is marked by clear outcomes, cultural reset, and deep engagement across public, private, and policy spheres. Prior to ACS, I was CEO of the Mortgage & Finance Association of Australia (MFAA), and Board Advisor and COO at fintech scaleup HashChing. I bring a proven track record of aligning people, strategy, and performance to deliver impact, always with a deep commitment to purpose-led leadership and system-level change. I hold an MBA from Macquarie Graduate School of Management, a Bachelor of Commerce in HR and Industrial Relations, and a Diploma in Project Management. A lifelong martial artist and advocate for personal discipline, I bring focus, perspective, and integrity to every role I take on.