Dr Greenfield is a former Chair of the Australian Nuclear Science and Technology Organisation (ANSTO). Apart from chairing the CRC for High Performance Soils, he chairs the International River Foundation.  He is both a Foundation Board member and chair of its International Scientific Advisory Committee.

He is a chemical engineer who worked at the University of Queensland for more than 35 years, holding senior roles including Deputy Vice Chancellor (Research), Senior Deputy Vice Chancellor and Provost and Vice Chancellor (2008 – 2011).

Dr Greenfield has extensive experience as a Board Director and has served on a number of company and CRC boards. He has worked widely with industry on a range of projects spanning the biotechnology, water and energy sectors.