Gretta joined Bluescope Steel as Chief Executive New Zealand & Pacific Islands in 2018. She was General Manager of New Zealand Aluminium Smelter since August 2013. Prior to this role, she served as General Manager Business Improvement and Technology in Pacific Aluminum's Brisbane office.
A trained engineer, she began her career in the aluminium industry in 1991. Gretta has advanced through roles in technical development and technical operations management before moving into manager level roles and has had broad exposure to a variety of aluminum smelting operations across the world, including Australia, New Zealand, Dubai, Brazil, Canada, France and the United States.