Annabelle Roxon
Annabelle was appointed to the Board of Westernport Water on 1 October 2019 and was reappointed on 1 October 2023 until 30 September 2027.
Annabelle is an experienced company director, also serving on the Board of Box Hill Institute. Annabelle is also a management consultant in the social sector who advises on strategy and outcomes management to a diverse range of clients including social purpose organisations and government.
In her prior experience as a lawyer for over 12 years, she has advised in procurement, sales and marketing, disputes and litigation, and mergers and acquisitions.
In addition to a Master of Business Administration, she holds a Bachelor of Laws (Hons), and a Bachelor of Arts.
Graham Hawke
Graham was appointed to the Board from 1 October 2021 to 30 September 2025 and is a member of the Westernport Water Infrastructure, Sustainability and Innovation Committee and the People, Safety and Community Committee.
Graham is employed as the Chief Scientist at TasWater and volunteers on the Strategic Advisory Committee of Water Research Australia.
Graham has held Non-Executive Director roles with the Antarctic Climate and Ecosystems Cooperative Research Centre and National Computational Infrastructure. He has diverse experience in government and global corporations overseeing strategy, engineering, research and corporate services.
Graham has a Bachelor of Engineering (Hons), Master of Engineering Science, MBA, a graduate member of the Australian Institute of Company Directors, a chartered professional engineer, a registered engineer (Vic) and a Fellow of Engineers Australia.
Joanne Pearson
Joanne was first appointed to the Board on 1 October 2017 and was reappointed on 1 October 2021 until 30 September 2025. Joanne is the Chair of Westernport Water’s Audit and Risk Committee and is a member of the People, Safety and Community Committee.
Joanne has significant experience as an executive and non-executive director and as a member of Audit and Risk Committees. Joanne is currently a Director of TasWater, is Chair of the Audit and Risk Committee and a member of the Environment, Public Health, Infrastructure and Climate Change Committee. In May 2025, Joanne was appointed as an External Member of the Phillip Island Nature Parks Audit, Risk and Finance Committee.
Joanne served as an independent member of the ActewAGL Safety, Audit and Risk Committee until October 2024 and as a member of the Audit and Risk Committee for the Uniting Church of Australia, Synod of Victoria and Tasmania until December 2024.
Her executive experience was primarily in large and complex, regulated energy businesses, with her last executive role as Chief Financial Officer of Jemena.
Joanne has an MBA and a Bachelor of Business in Accounting, is a Fellow of CPA Australia and a Graduate of the Australian Institute of Company Directors.
Tanya Ha
Tanya was appointed to the Board of Westernport Water on 1 October 2019 until 30 September 2023 and was reappointed until 30 September 2027.
Tanya is the Chair of Westernport Water’s Infrastructure, Sustainability and Innovation Committee and a member of the People, Diversity and Customer Committee.
Tanya is an award-winning science journalist, best-selling author and environmental advocate. She is currently Director of Engagement at the specialist science communication agency Science in Public.
Tanya currently serves on the board of Greenfleet and is Director of Engagement at Science in Public. She is also on the advisory groups of the Marine Energy Research Centre and Science Gallery Melbourne. She is a past Vice President of Science & Technology Australia and has served on the boards of Diversity Council Australia, Sustainability Victoria and Keep Australia Beautiful.
Tanya has a Bachelor of Science (Chemistry) and a Master of Environment. She is best known for her popular environmental guidebooks Greeniology and Green Stuff for Kids, and her media work, including reporting for ABC’s Catalyst. In 2010, she won a UN Association of Australia media award for environmental reporting.
Leigh Berrell
Leigh was appointed to the Board of Westernport Water on 1 October 2019 until 30 September 2023 and was reappointed until 30 September 2027.
Leigh is a member of the Audit and Risk Committee and the Safety, Sustainability and Innovation Committee.
Leigh is an independent consultant who has previously served in executive roles with Yarra Valley Water, Icon Water and ActewAGL and the National Archives of Australia.
Leigh brings more than 30 years of technology leadership experience across a range of sectors including utilities, aerospace, transportation and logistics, government peacekeeping and workforce staffing services.
Leigh holds an MBA, an Honours Degree in Computer Science, a Graduate Certificate in Business and Technology, is an alumnus of the Darden Executive Program, and is a Graduate of the Australian Institute of Company Directors.
Jethro Calma-Holt
Jethro is Westernport Water’s first Independent Aboriginal Delegate appointed in December 2024, for a 12 month period and has recently been extended for another 12 months. Jethro is Kungarakan and Iwaidja, with a passion for engaging with Aboriginal and Torres Strait Islander people to identify needs and implement strategies to improve education, health and wellbeing.
Jethro is the National Indigenous Participation Specialist at the AFL, providing leadership and support to states and territories on delivery and evaluation of the AFL’s Aboriginal and Torres Strait Islander Action Plan. For nearly four years prior, he led Carlton Football Club through whole of club improvements to respect, represent and empower First Nations culture.
Other significant roles for Jethro include the National Indigenous Manager at SEDA Group, developing organisational change initiatives and supporting people through their studies, traineeships and transition to work. Jethro has also taken part in the Observership Program on the Board of the Koorie Heritage Trust.
The Independent Board Delegate role is designed to assist in developing the skills and experience relevant to applying for a Board position within the Victorian water sector. This appointment aligns with the Victorian Government’s Water for Victoria policy, which aims to increase opportunities for First Peoples in water management.
Kushal Shah
CA, LL.B, Executive MBA (Melbourne Business School), B.Com, M.Com, CIA, Cert. in ESG
Kushal Shah is an accomplished finance, governance, risk, and ESG professional with over 22 years of experience across public and private sectors in Australia, Asia, and Europe. He currently serves as Chair of Kooweerup Regional Health Services, Board Director at VITS Language Loop, and as an independent Audit & Risk Committee member at VicScreen and the Melbourne Recital Centre. As Managing Partner of DBS Global, Kushal advises Boards and executives on ESG strategy and operations, financial stewardship, governance transformation, and risk culture.
Kushal has held senior roles with Big 4 firms and large corporates, bringing deep industry insights across healthcare, government, technology, energy, logistics, manufacturing and retail. He is recognised for his ability to strengthen governance, improve financial management, drive organisational performance, and achieve strategic objectives.
He is known for navigating complexity with clarity, integrating policy, commercial, and operational insight to support evidence-based, future-focused decision-making that delivers long-term value. Kushal has a proven record of building trusted relationships, build consensus, and collaborate with and influence diverse stakeholders.
Kushal was appointed to the Board of Westernport Water on 1 October 2023 until 30 September 2027.