Preston was Principal Solicitor at the NSW Environmental Defender's Office from March 1985, overseeing its official opening in May that year.[3]
Appointed a Senior Counsel (SC) by the NSW Bar Association in 1999.
He received in 2010 an award from the Asian Environmental Compliance and Enforcement Network (AECEN) for his environmental work.[4]
In February 2018 the then Governor of New South Wales, General David Hurley AC DSC(Rtd) promulgated the election of Brian Preston as a Fellow of the Royal Society of NSW (FRSN - Est 1821, Act of Parliament 1888 for the advancement of Science, Philosophy, Literature and the Arts) in the NSW Government Gazette.
In 2018 he received an honorary Doctor of Letters from his alma mater Macquarie University and in 2022 an honorary Doctor of Laws from Western Sydney University. Justice Preston is also an adjunct professor at the University of Sydney, and Southern Cross and Western Sydney Universities. He was awarded the Medal of Honor by the World Jurist Association in 2023.[5]
^Robinson, David (1996) "The Environmental Defender's Office NSW, 1985-1995" in Environmental and Planning Law Journal [June 1996] - "edo.org"(PDF). Archived from the original(PDF) on 1 April 2012. Retrieved 13 October 2011.
^Trevor Daya-Winterbottom, Profiling Justice Brian Preston (Environmental Law Annual Colloquium, University of Waikato, New Zealand).