Meet The Team

Our Support Centre

Dr Guy Turnbull

Managing Director

Arthur Mitsioulis

Director | Strategic Alliances 

Rona Dean

NDIS General Manager 

Marie Astrero

Financial Administator

Our Board

Tanya Cole, Chair

Tanya Cole is the Hessel Group Chief Executive Officer. Tanya is a trusted and respected leader in the community and is often called on to contribute with comment for media interviews and programs drawing on her experience and knowledge of the social care industry. Tanya has an in depth knowledge of the industry and contributes to many industry boards, committees and panels and is often invited to judge for community and industry awards. Tanya founded the Hessel Group in 1998 who are specialists in the Social Care sector, providing a full circle of care, support and training. An experienced public speaker and presenter, Tanya will often feature at industry events and meetings where she openly shares her strategies, successes and the life lessons gained through her career.


2018 SA Training Awards Finalist | 2018 & 2012 Ernst & Young Entrepreneur of the Year Finalist

2017 Telstra Business Awards Finalist | 2016 Impact Awards Finalist

Dr Guy Turnbull, Managing Director 

Dr Guy Turnbull is an award-winning, internationally recognised social entrepreneur. Highly acclaimed in his field, he has been a major figure in the co-operative and social enterprise sector since 1988, including building a $17m care co-operative from scratch. And co-creating the Rapid Enterprise Development (RED) program – an innovative approach to social enterprise development with disabled people. he was the 2018 Don Dunstan Foundation Thinker in Residence focused on building South Australia’s social economy.

In 2016 Guy’s work in the care sector was recognised by The Great British Care Awards where he became national winner in the ‘Outstanding Contribution To Social Care’ category. He was also the winning UK national finalist in EY’s prestigious global competition, ‘Entrepreneur of the Year’.

Arthur Mitsioulis,  Director of Strategic Alliances 

Arthur Mitsioulis has over 36 years of experience in healthcare ranging across a broad sector in the private and public markets, in the life sciences, pathology, primary care, hospitals, and the pharmaceutical market.

Over these years, Arthur’s passion for driving change has been in the forefront, with several first introduced that have enhanced the delivery of a client’s/patient’s journey as well as increase in customer satisfaction globally. Innovation and enhancements have been introduced, across service redesign, strategic partnering models, educational forums and programs for healthcare professionals.  

Arthur’s desire for wanting to make a difference, and bringing multidisciplinary stakeholders together, and importantly understanding the real challenges have led to codesigning of models, that have improved outcomes.  

Creating environments where people feel engaged and have the opportunity to prosper has been consistent across my career, which is why I am passionate about the VIVA model. Concurrently being able to redefine the health/ social sector market, that leads to improved outcomes for clients, payers and families is pivotal, is why I believe VIVA will make a difference.  

Steven Russo CA, Finance & Risk

Steven is the Audit and Assurance Partner at PKF Adelaide and has over 23 years’ experience in providing audit, risk and technical advisory services. He is a Not-For-Profit specialist and regularly lectures for the Department of State Developing on financial modelling specific to NDIS providers and NFP organisations.

Louise Cross, Compliance 

Louise Cross is a leader skilled in governance and strategic planning having lead organisations to achieve and maintain compliance to the following Australian and International Standards: NDIS Quality and Safeguarding framework, ISO 14001 Environmental Management systems, ISO 9001 Quality Management systems and AS/NZ 4801 Safety Management systems working across a large diverse industry sector.

Louise brings her experience and background as a “big picture”, strategic thinker who understands how organisations need to address compliance matters in alignment with and in support of the company’s overall strategic direction to VIVA Mutual.