Aged 23 he jointly founded Kinnaird Hill de Rohan and Young (later Kinhill Engineers Pty Ltd) as a partner and then Director.
The loss of his daughter, Alison, and son-in-law, Francis Gaillard, in the 1987 Zeebrugge ferry disaster was a turning point in his life.
He was closely involved in a continuing program of development that transformed facilities for players, spectators and officials, completed on time and within budget, thanks largely to his supervision.
At Lord's his most significant achievement was the widely praised £8 million (A$20) refurbishment of the Victorian Pavilion, completed as the 2006 season opened.
Since his death his home city of Adelaide has created a number of memorials, including the Maurice de Rohan International Scholarship[8] at the University of South Australia.