Ms Herd said she was stepping down to avoid any conflict between the role and her new job.
"It has been an absolute pleasure to serve as Environment Commissioner. The Greater Sydney Commission plays an incredibly important role in guiding the development of Sydney in a way which aims to maximise the environmental, social and economic opportunities available through careful planning and an innovative approach to precinct
development," Ms Herd said.
The Commission, including the Social and Economic Commissioners and the District Commissioners play a vital role in delivering thought leadership on important city-framing issues, as well as remaining deeply connected to local pressures and issues requiring a considered approach.
Chief Commissioner Geoff Roberts AM said the Commission congratulated Emma on her new role and wished her all the best.
"Emma has only been with us since September last year, but she has brought to the Commission tremendous knowledge and insights into future planning for the sustainability of Greater Sydney. Her appointment to her new role is a wonderful reflection of the high regard in which Emma is held as a leader in the field," Mr Roberts said.
A recruitment process will commence shortly.