Dr Gary Theseira chairs the council of Climate Governance Malaysia (CGM), the Malaysian Chapter of the Climate Governance initiative under the World Economic Forum. He is also an adjunct faculty member at the Asia School of Business (ASB), serves on the board of the Centre for Environment, Technology and Development Malaysia (CETDEM), and is an advisor to the Malaysian Green Technology and Climate Change Corporation (MGTC).

Previously, he was Deputy Undersecretary for Climate Change at the Ministry of Natural Resources and Environment (NRE) and negotiated for Malaysia at 14 UN Climate Change Conferences (COPs). In 2012, the G-77 and China appointed him to coordinate negotiations leading to the 2015 Paris Agreement. In 2018, he was appointed by the Minister of Energy, Science, Technology, Environment and Climate Change, YB Yeo Bee Yin, as Special Functions Officer on Environment and Climate Change.

Dr Theseira has a PhD in Agronomy from Mississippi State University and conducted post-doctoral research at the University of Minnesota.