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 and four 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.

Dr. Antoinette Mertins

General Manager, Aged and Primary Care


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Antoinette has extensive experience working in the public and not-for-profit sector across a diverse range of organisational forms.  Antoinette has strong skills in driving workforce reform, development of innovative community based models of care and developing partnerships across aged care, health and primary care sectors.

Antoinette is a public health practitioner with an extensive background in community based health care leadership and management, service planning and development, and leading diverse multidisciplinary teams to deliver innovative services.  Antoinette is committed to population health approaches as a means to improve health and wellbeing outcomes.

Antoinette holds a Doctor of Public Health degree, a Post Graduate Diploma in Health Research Methodology and a Bachelor of Behavioural Sciences (Psychology).  She is an Associate Fellow of the Australian College of Health Service Management.  Antoinette is a recent Graduate and member 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 Pastoors

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.

Amie Reed

Chief Impact Officer

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Amie has over 10 years’ experience working in the mental health and community health sectors in leadership and operational roles, delivering high quality cultural transformation initiatives and strategic corporate support.

Amie has a background in human resources, and strong skills in change management, industrial relations, cultural transformation and leadership initiatives that deliver high employment engagement and workforce capacity.

Dr Carolyn Wallace

General Manager, Family and Community



Carolyn’s diverse career demonstrates a focus on community wellbeing and social inclusion through numerous roles managing local services relating to the social determinants of health while also seeking to influence state and national social policy. Carolyn has a passion for regional development and has held senior roles in local government and local development in Victoria and Ireland.

Carolyn’s strengths are in community engagement, partnership development and participatory research. She is experienced in navigating the competing demands and expectations that arise from partnerships with business, government, and community organisations. Carolyn’s expertise has been acknowledged through appointments to boards and committees such as Castlemaine Health, Royal Flying Doctors Research Advisory Committee and regional partnerships.

Carolyn has completed the Partnership Brokers Association training and is a Graduate of the Australian Institute of Company Directors. Carolyn holds a Bachelor of Arts in psychology, a Graduate Diploma in Education and a Master of Public Policy and Management. Carolyn’s PhD research focused on improving access to health and community services for hardly reached people.