Born in
Gisborne, New Zealand, Clark began his criminal career through petty crimes and was well known to police as a local thug. His career expanded in the mid-1970s after meeting
Marty Johnstone, who at this stage was doing financially well importing cannabis "buddha sticks" into New Zealand from Southeast Asia. Clark and Johnstone, wanting to expand their market and money, started importing high quality white
heroin into New Zealand and Australia. This was about the time Clark moved to Australia to head the operation there. Their Asian partner based in Singapore was Choo Cheng Kui, better known as "Chinese Jack", or Jack Choo. Clark was a ruthless controller of his operations and killed a number of associates, including Gregory Ollard, a Mr Asia drug supplier and heroin addict. He lured Ollard to
Ku-ring-gai Chase National Park in the northern suburbs of Sydney, where he killed, mutilated and buried him. After killing him, he drove to the home of Ollard's girlfriend in
Avalon and abducted her. He then drove her to the
Blue Mountains where he killed her. ==Women==