Leadership team

The Executive Leadership Team lead the staff of Merri Health to achieve common goals that are in line with Merri Health’s vision and purpose.

Members of this team include our Chief Executive Officer, Chief Financial Officer, Chief Operations Officer and two General Managers.

Tassia Michaleas

Chief Executive Officer


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Tassia has extensive experience in the not-for profit and community sector and commenced her career in community health in 1996. Tassia has experience working across leaderships and operational areas and takes a pro-active approach in developing and delivering innovative services and programs, to identified and emerging community needs. Tassia has strong skills in advocacy, streamlining of systems and processes, effective engagement of stakeholders and developing partnerships. Tassia is committed to and has an in-depth understanding of the values and philosophy of community health, including issues related to access, diversity and the social model of health. 

Tassia holds Bachelor of Economics, a Bachelor of Social Work and a Master of Business Administration. She is an Associate Fellow of the Australian College of Health Service Management and a Graduate of the Australian Institute of Company Directors.

Maryanne Tadic

General Manager, Healthy Communities


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Maryanne has over 15 years of experience working in the community health sector within both leadership and operational contexts, and has a strong understanding of the diverse range of service delivery areas as well as reform challenges within the community health environment.

Maryanne has a background in population health and has experience in leading a number of community-based research projects, with extensive skills in strategic planning and evaluation.

Maryanne is passionate about driving change through innovation, and applying a systems thinking approach to achieve health and wellbeing outcomes in communities. Maryanne holds a Master of Public Health degree (Health Services Management) and a Bachelor of Health Sciences (Health Promotion). She is an Associate Fellow of the Australian College of Health Service Management and a member of the Australian Institute of Company Directors.

Gavin Thompson

Chief Financial Officer

B.Bus (Acc), GAICD, CPA

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Gavin has held a range of senior finance positions across not for profit, corporate and international sectors. He has worked in financial management in the homelessness and community service sector as well as roles in a variety of industries such as Aerospace, Investment Banking, Software Development, Retail Banking, Hotels and Trustee services.

Gavin has skills in providing strong financial stewardship to organisations while maintaining a co-operative and helpful approach to aid service delivery programs.

Gavin holds a Bachelor of Business, is a Graduate of the Australian Institute of Company Directors and is a Certified Practising Accountant (CPA).

Nessá Wright 

Chief Operating Officer


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Nessá is a values-driven and collaborative leader who utilises her creative flair to enhance business operations and strengthen governance across varied settings in the not-for-profit sector. With vast experience in change management, governance, brand and communications, successful project delivery and organisational capacity building.

Nessá is known for her ability to lead both small and large initiatives across the organisation that impact on relationships and create a culture where outcomes are achieved in the right way. The experience of the end-user is always front of mind in how Nessá leads her team to design, deliver and evaluate their impact.

Nessá holds a Bachelor of Criminology and Criminal Justice, Masters of Employment Relations, and an Executive Masters of Business Administration. Nessá is a certified member of the Australian Human Resources Institute and Australia College of Health Service Management and is an Accredited Lean Yellow Belt through the Australian Healthcare and Hospitals Association.

Shadi Hanna 

General Manager, Aged and Primary Care

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Shadi has extensive experience in leading multidisciplinary teams and a broad range of programs and services in the community health and community care sectors. 

He has held senior and executive management roles across a range of health, primary care and local government organisations.  

Shadi is committed to providing quality services that are responsive to local needs.

Shadi is a registered physiotherapist and has a Graduate Diploma in Health Service Management and a Master of Business Administration and is a Graduate of the Australian Institute of Company Directors.