In 1972 he moved back to Sydney, Australia and became a senior lecturer in the Department of Computer Science at the University of New South Wales (UNSW).

In addition, he wrote the ‘Source Code and Commentary on Unix Level 6’ and handed cardboard bound copies on computer printout paper to his astonished students.

Containing the entire UNIX 6 operating system, the book proved an invaluable teaching resource and a technical bible for a whole generation of professionals.

It was the only time in my life I was an active member of an underground.’ [Mr Peter Reintjes (BE ’xx) quoted in the Sydney Morning Herald, 11 December 1999].

At the same time, a Lions Chair in Computer Science was established, funded partly through the University, but largely through the tremendous efforts of former students who he motivated and inspired with his teaching and research and who acknowledge his defining influence on their professional lives.

The School of Computer Science and Engineering has continued to base a significant amount of its teaching on UNIX-like systems, nowadays Linux.

Of the Usenix donations, US$6,000 came from the 1998 auction of the California UNIX license plate by Ted Dolotta, won by John Mashey, who had lent his copies of the Lions books (used in Bell Labs internal courses) and never gotten back.