Tim’s appointment is the latest step in the leadership structure established following Brian Restall’s appointment as Chief Executive Officer in June 2025, creating a CEO-led operating model to drive the next phase of Quinbrook’s growth while retaining the strategic guidance of Quinbrook’s founders.

Tim joins Quinbrook’s global leadership team, led by Brian Restall, alongside Regional Leader North America, Giulia Siccardo and Regional Leader UK, Keith Gains.

Tim began as Managing Director in Quinbrook’s Australian team in February 2026, reporting to Brian Restall. Since then, Tim has managed the firm’s Australian business and has played a key role in advancing Quinbrook’s development and investment activities across one of the world’s most important energy transition markets. His appointment as Regional Leader formalises his responsibility for leading Quinbrook’s Australian investment team and business operations.

Tim has more than 20 years’ experience in leading large-scale energy and infrastructure investments in Australia. Prior roles include CFO and Deputy CEO of Australia’s largest natural gas consortium APLNG, a $25bn project, and Head of Strategic Partnerships and Investment Management roles for Origin Energy, Australia’s largest electricity retailer. His experience spans project development, financing, construction, operations and strategic partnerships across Australia’s energy sector.

Brian Restall said Tim’s appointment marks the next stage of Quinbrook’s leadership evolution initiated last year with the newly created CEO role and positions the firm strongly for its next phase of growth.

“When I was appointed CEO, we outlined a leadership structure designed to empower exceptional leaders in each of our core markets while strengthening collaboration across our global business. Tim’s appointment as Regional Leader for Australia completes that structure and marks an important milestone in Quinbrook’s evolution as a founder-guided, CEO-led firm.

“Since joining Quinbrook earlier this year, Tim has demonstrated outstanding leadership of our Australian business and has further strengthened our presence in a market that is central to Quinbrook’s past and future success.

“Tim’s experience further enhances Quinbrook’s industrial DNA and, alongside Keith Gains in the UK and Giulia Siccardo in North America, completes a model that keeps decision-making close to our markets while leveraging the strength and expertise of our global platform. Together, we are well positioned to continue building Quinbrook as a leading specialist investor in the infrastructure needed for the energy transition.”

Tim Horneman said he was excited to take on the role as Quinbrook continues to expand its activities across Australia.

“Australia remains one of the world’s most attractive and important energy transition markets, with significant opportunities driven by industrialisation, electrification and digitalisation. Quinbrook has established itself as a leading specialist investor in energy transition infrastructure in its core markets, with a strong track record of developing and delivering high quality projects. I look forward to working with Brian, our global leadership team and colleagues across the business to continue building on that success and delivering value for our investors and stakeholders.”

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Global CEO appointment

Brian Restall, currently Quinbrook’s Australian Regional Leader, will transition to the newly created role of CEO of Quinbrook by year end. Brian will assume overall leadership responsibility for the management of all Quinbrook regional teams based in North America, Europe and Australia. Brian has worked for Quinbrook since its founding in 2015, and with the Founders in their predecessor investment management roles since 2011. Brian has more than 28 years’ experience in energy-related infrastructure investments and operating businesses in Australia, the US, Europe and Africa.

Brian has led over US$20 billion of power project development, over US$4 billion in power asset construction and was the inaugural CEO of Cape Byron Power, Quinbrook’s first portfolio company. He was also instrumental in the development of Quinbrook’s award winning Gemini solar + storage project in the US and most recently led the development and execution of Quinbrook’s Supernode project in Australia, which has set new industry records for the long-term offtake contracting and financing of battery storage.

New regional leader for North America

Giulia Siccardo joins Quinbrook as Managing Director and succeeds John Lucas, who leaves at the end of the month, as the Regional Leader of Quinbrook for North America. Giulia was most recently at the U.S. Department of Energy in Washington, D.C., in her role as the first ever Director of Manufacturing & Energy Supply Chains, a new investment arm for the Department of Energy. Giulia oversaw the deployment of tens of billions of dollars in investments, building a portfolio of energy infrastructure projects spanning design, engineering, construction and delivery. She also led the development of the National Security Council’s energy supply chain strategy. Prior to her role for the US Government, Giulia spent over a decade as a partner of McKinsey & Co in San Francisco and New York.

“As Quinbrook grows, we have been working to establish a leadership structure that further empowers our people to lead our firm into its second decade and beyond. As Co-Founders, Rory and I are proud of what we’ve built together since establishing the firm in 2015. We believe this new leadership structure equips Quinbrook with exceptionally talented leaders as we continue our journey as a value-add specialist in the energy transition,” said David Scaysbrook, Co-Founder and Managing Partner of Quinbrook.

Leadership of digital strategies

Kathryn Lin, a Director in Quinbrook’s North American investment team, has been promoted to Senior Director and leader of Quinbrook’s digital infrastructure strategies. Kathryn is the investment lead and a director of the Board of Quinbrook portfolio company Rowan Digital Infrastructure. Kathryn is an infrastructure investment specialist with more than a decade of experience across infrastructure investments, project development, M&A, financing and asset management.

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