From 1963 to 1982, McCusker also served as a part-time lecturer at UWA's Faculties of Commerce and Law. He was appointed Queen's Counsel in 1982, and subsequently served as chairman of a number of legal committees in Western Australia, including the Legal Aid Commission of Western Australia and the Western Australian Constitutional Committee. In 1989, McCusker was appointed special inspector to investigate the collapse of Rothwells Merchant Bank. His report led to the establishment of a royal commission to examine the "WA Inc" scandal, and several criminal prosecutions.[3] Having first become involved in surf lifesaving in 1955, McCusker is a member of the North Cottesloe Surf Livesaving Club. In October 1997, he was involved in the rescue of two men, including former Australian rules footballerBrian Sierakowski, whose surf ski had been bitten in half by a five-metre (16-foot) long white pointer shark 50 metres (160 ft) off of Cottesloe Beach.[5]
In June 2014, McCusker retired as governor when his three-year term expired, and resumed practice as a barrister in Perth.[10] He was succeeded by Kerry Sanderson, taking office on 20 October 2014.[11]
McCusker is a supporter of voluntary assisted dying. In late 2018 and early 2019, he led a panel to draft voluntary assisted dying laws for the McGowan government. The laws were passed by the parliament in December 2019.[12]
Personal life
McCusker married Tonya Batalin in 2007, with whom he has one child.[13] He is also stepfather to Tonya's two other children. He also has three adult children from a previous marriage, four grandsons and one granddaughter.