Meet the leadership team

OET Leadership

Our Executive team are dedicated senior leaders passionate about connecting the world to better healthcare. They bring a wealth of experience to provide strategic oversight and leadership for OET.

Michael O'Sullivan, Chief Executive Officer

Michael O'Sullivan is the Chief Executive Officer of OET, bringing 20 years of leadership experience in strategy and P&L. He is a dynamic and purpose-driven leader known for his hands-on approach and ability to inspire high-performing teams. Michael's career spans healthcare, technology and business services across Australia, Europe and North America.

Before joining OET, Michael served as a senior executive at several global healthcare companies in Australia and North America where he successfully led global operations, business expansion, digital transformation and performance improvement initiatives. He excels in driving change, enhancing customer experiences, and implementing innovative solutions. His leadership style is transparent and collaborative, always focused on achieving the best outcomes for customers, partners and staff alike.

Michael holds a Master’s degree in Applied Finance from Macquarie University and a Bachelor’s degree in Economics from Monash University.

OET - English language test for healthcare professionals

Jaime Cortes, Chief Operating Officer

Jaime Cortes leads OET’s operations, heading up a large globally dispersed team. He is responsible for managing a complex, diverse supply chain across 60+ countries.

A transformational leader with strong commercial and business acumen, Jaime brings 20 years of experience from companies in the Pearson portfolio in strategic execution, operational management, and business transformation in the global education sector.

Jaime has held senior commercial, operational, and transformation positions in the United Kingdom and Australia and led international teams for over a decade. He has worked across assessment, qualifications and content publishing, and has led large-scale educational projects in Latin America and the Middle East.

Greg Barclay, Chief Transformation Officer

Greg Barclay is a senior executive leader with extensive experience in delivering strategies, leading transformation programs and driving business change in regulated and lean environments. He excels in establishing and leading Enterprise Project Management Offices (EPMO) from scratch, overseeing project and change delivery functions with optimal methodologies, purposeful tools and effective governance.

As the former GM Transformation and EPMO at Healthscope, Australia's national private hospital group with 39 hospitals, Greg spearheaded a transformative effort to enhance Healthscope's simplicity, intelligence, safety and connectivity, laying the foundation for future growth.

Marco Delgado, Chief Experience Officer

Marco Delgado leads OET's customer and marketing teams and is responsible for driving brand growth and customer engagement.

He brings a wealth of experience in the higher education sector, with his expertise spanning across customer experience, brand strategy, marketing technologies and demand generation.

Recognised for his strategic mindset, creative flair and data-driven decision making, Marco is dedicated to delivering exceptional results and shaping impactful customer experiences that resonate with diverse target audiences.

Sarah Leslie, Chief Financial Officer

Sarah Leslie leads OET’s financial operations. She is a highly accomplished CFO with a demonstrated history of driving financial success and operational excellence.

With extensive experience in financial management, strategic planning, and risk mitigation, Sarah has played a pivotal role in steering organisations towards sustainable growth and profitability. She holds a strong track record in optimising financial performance and implementing robust internal controls.

With her strategic mindset and keen financial acumen, Sarah is dedicated to driving financial strategies that support the long-term success of OET.

Adam Phillips, Chief Commercial Officer

Adam Phillips oversees the global commercial team, responsible for delivering revenue through developing and building key stakeholders both in government department relationships, private sector, and regulatory bodies and managing OET's test venue network. He brings more than 20 years of commercial experience, specialising in start-ups, turnarounds, and innovation businesses both in Australia and overseas.

With a growing commercial team spanning Australia, Europe, Africa, South Asia, and South-East Asia, Adam's leadership style fosters team energy and engagement, driving results that yield bottom-line benefits and personal growth across diverse cultures.