The essence of Healthy Land and Water is its people. We are a passionate team of leaders, scientists and engineers dedicated to improving and protecting South East Queensland’s environment.

Board of Directors

Stephen Robertson


Stephen Robertson is a consulting expert in environmental sustainability and natural resource management and was named inaugural chairman of Healthy Land and Water in 2016. Previous to joining Healthy Land and Water, Stephen was a state government minister for 13 years and was responsible for portfolios including energy, water, natural resources, mines, trade health and emergency services.

Stephen is highly regarded for his insight and for his ability to identify emerging challenges and develop strategies to effectively deal with them. He is passionate about community engagement and collaboration and is dedicated to finding science-based solutions to environmental issues affecting South East Queensland and beyond.

Other roles:

  • Chairman of NRM Regions Queensland
  • Non-executive Director of Greening Australia

Cameron Costello


Cameron Costello is a Quandamooka man from Moreton Bay, Queensland, who brings a deep knowledge of First Nations people’s role in natural and cultural resource management to the Healthy Land and Water Board.

He has over 15 years’ experience delivering First Nation policies and programs including the establishment of the Queensland Government’s Backing Indigenous Arts Program, the Cairns Indigenous Art Fair and the Black Diamonds Program for Brisbane City Council. Cameron is also Chair of Healthy Land and Water’s Indigenous Engagement Committee.

Most recently, Cameron completed seven years as the CEO for the Quandamooka Yoolooburrabee Aboriginal Corporation (QYAC).

In 2020, Cameron received both the Griffith University Outstanding First Nation Peoples Alumnus Award and the University of Queensland Indigenous Community Impact Award.

Melissa Impiazzi


Melissa is a senior executive and consultant with over 20 years’ experience gained in Australia and the United Kingdom in financial services, asset management, recruitment and change management. Her career to date has focused on business development and the strategic management of key client and stakeholder relationships.

During her eight years at QIC, Melissa predominantly focused on the strategic management of their foundation clients including many key Queensland state bodies and associated organisations. Her non-executive director experience has been gained in the philanthropic, social venture and not-for-profit sectors. She is a Director of the Board of Governors for the Queensland Community Foundation (QCF) and has served on the Queensland Advisory Committee at Social Ventures Australia (SVA).

Melissa holds a Graduate Diploma of Applied Finance and is a graduate of the Australian Institute of Company Directors.

Melissa is excited to join Healthy Land and Water and work towards our strategic goals of sustainability and growth for the future.

Nadia O’Carroll


Nadia O’Carroll is a qualified accountant with experience in chartered accountancy, academic administration and as a self employed professional. Nadia was Division 2 Councillor for the Scenic Rim Regional Council from 2012 to 2020. During her term in council she held positions as Finance Chair and Deputy Mayor as well as being appointed to a number of committees including Gondwana Rainforests of Australia World Heritage Community Advisory Committee.

Nadia has a long history of volunteering in the not for profit sector including emergency services, natural environment, animal welfare, citizen science, arts and culture, sport and public health.

With a strong interest in the natural environment, science and biodiversity Nadia is passionate about the role of Healthy Land and Water in improving social and environmental outcomes in South East Queensland and beyond.

Simon Warner


Simon Warner is an experienced Director and corporate executive. Simon has a history of successfully leading and managing both corporate and not for profit enterprises. He is currently Executive Chairman of an enterprise software company, Tactiv Pty Ltd. Previously he was Chief Executive Officer and Director of SEQ Catchments Ltd.

Simon has a Business degree and a post graduate qualification in IT and has spent a good deal of his working career in executive roles ranging from IR to Logistics and Operations management. He has also worked closely with government on policy and regional planning issues including overseeing the development of the South-East Queensland Rural Futures Strategy and the SEQ Regional NRM plan.

He is passionate about agricultural sustainability and innovative ways to fund and support positive social and environmental outcomes. Simon lives at Murphys Creek in the Lockyer Valley and operates a small grazing holding in addition to his corporate activities.


Nikki Poteri-Collie


Nikki Poteri-Collie is a senior leader with more than 25 years’ experience building the strategic and financial success of organisations across the water, energy, mining and industrial sectors. With a diverse background gained in large corporations and government agencies, Nikki brings extensive experience across commercial and financial management, strategy and business planning as well as marketing and business development.

In addition to her board role at Healthy Land and Water, Nikki is General Manager Finance, Strategy and Growth, Asset Services with Downer EDI Limited. Prior to joining Downer, Nikki held executive roles with Seqwater and Thiess.

With a passion for the environment and the health of Australia’s precious waterways, Nikki is driven to apply her experience and skills to ensure the enduring success of Healthy Land and Water so that it continues to deliver for future generations.

Rhett Duncan


Rhett Duncan has more than 15 years’ leadership experience at executive and general management levels. In his role as Executive Manager Customer Delivery at Unitywater, he is responsible for the safe and efficient operation of the water supply and sewerage systems to provide reliable services to customers.

Rhett has previously worked in Waste Management, Transport Infrastructure and Construction Materials and led teams in challenging and changing business environments.

He is experienced in working across all levels from the Board to the front line with a demonstrated track record for engaging, building and leading teams that deliver results in challenging and changing business environments.

Executive Team
Portfolio Management
Strategic Science and Partnership
Knowledge Research
Climate Adaptation
Biodiversity Conservation
Land Restoration
Environmental Offsets Team
Marketing and Communications
Corporate Services

Get in touch

Healthy Land and Water is dedicated to the care of our unique and beautiful land, waterways and biodiversity.

  • Address: Level 19, 160 Ann Street Brisbane QLD 4000
  • PO Box: 13204, George Street Brisbane QLD 4003
  • Phone: (07) 3177 9100
  • Fax: (07) 3177 9190
  • Email:

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