Simon Molesworth AO, QC (born 2 April 1954) was the foundation Chairman of the Executive Board of the International National Trusts Organisation ("INTO") (to September 2015). From 2005 he was an inaugural member and then Chair of the INTO Steering Committee. As Chairman of INTO, Molesworth leads INTO's work on Climate Change, and was INTO's Head of Delegation to the UN's UNFCCC COP15 in Copenhagen, COP16 in Cancun, COP17 in Durban and COP18 in Qatar. He is the author of The Victoria Declaration on the Implications for Cultural Sustainability of Climate Change and regularly speaks at international and national fora on climate change, sustainability, renewable energy, environmental policy & law and heritage.
In 1985 Molesworth became a founder of the then Environment Institute of Australia, the institute of practitioners whose core professional discipline is environmental management, becoming its public officer upon incorporation, remaining in that office for 15 years. During his 10-year presidency of the Institute from 1995 to 2005, he guided its expansion in to New Zealand in 2002, it thus becoming the Environment Institute of Australia and New Zealand, and oversaw the creation of the Certified Environmental Practitioner Scheme, becoming a foundation member of the C.Env.P. Board.
In 2013 Molesworth was appointed a Vice Chancellor's Professional Fellow at Monash University following his appointment as a Adjunct Professor of La Trobe University's La Trobe Institute for Social & Environmental Sustainability in 2010. Molesworth was a councillor of the National Trust of Australia (Victoria) from 1980-2005, during which time he was honorary chairman and then president for almost 20 years. From 1988 to October 2009 he was a board member of the Australian Council of National Trusts and was its chairman 2001-06. In this capacity he participated in national co-operative forums: the Regional Cultural Alliance (2003–06) and the National Cultural Heritage Forum (2002–07). From late 2009 to November 2015, Molesworth was the ACNT's International Affairs Ambassador, representing the Australian National Trusts on the INTO World Congress and at other international forums.
Molesworth was appointed an Acting Judge of the Land and Environment Court of New South Wales for 2017 After initially practicing as a solicitor (from 1978), Molesworth became a barrister in Victoria in 1984 and was appointed a Queen's Counsel in 1995, specialising in environmental, planning, heritage and natural resource law. Amongst his previous legal appointments Molesworth was a Senior Legal Member of the Planning Division of the Administrative Appeals Tribunal of Victoria and a Senior Legal Member of the Victorian Planning Appeals Board and the Victorian State Mining Warden. In recognition of his senior work in his multi-disciplinary career, Molesworth has been elevated to that of fellow in five professional institutes. With an experience extending over 35 years of community leadership and corporate governance, Molesworth has been a director of some 22 (of which four were in the commercial sector) and chairman or president of 14 of them. Amongst 4 in the natural resources field, Molesworth was to mid-2010 chair of Greenearth Energy Limited, a geothermal energy company.