Background: Chong was born at the University of Alberta Hospital in Edmonton, Alberta, on May 24, 1938, and given the name Thomas B. Kin Chong at birth. His mother was Lorna Jean (nee Gilchrist), a waitress of Scots-Irish ancestry, and his father was Stanley Chong, a Chinese truck driver who emigrated to Canada from China in the 1920s. The senior Chong had first lived with an aunt in Vancouver after arriving in Canada. As a youth, Tommy Chong moved with his family to Calgary, settling in a conservative neighbourhood Chong has referred to as "Dog Patch".
Context: In 2003 Chong became caught up in two American investigations, code-named Operation Pipe Dreams and Operation Headhunter, which tried to trace drug traffic and users through businesses selling drug paraphernalia, mostly bongs. Operation Pipe Dream was run from Pittsburgh. US Attorney for Western Pennsylvania Mary Beth Buchanan oversaw the case. The estimated cost of Operation Pipe Dream was over $12 million and included the resources of 2,000 law enforcement officers. Fifty-five companies that sold drug paraphernalia over the Internet were the subject of the investigation, and Nice Dreams was one of them.  Chong was charged for his part in financing and promoting Chong Glass/Nice Dreams, a company started by his son Paris. His case never went to trial, as his attorney negotiated a plea agreement with the US Attorney for the Western District of Pennsylvania's Office. He admitted to distributing 7,500 bongs and water pipes on the Internet through Nice Dreams, a family company. Chong agreed to plead guilty to one count of conspiracy to distribute drug paraphernalia in exchange for non-prosecution of his wife, Shelby, and his son, Paris. Chong cooperated with the government and was the first of the Operation Pipe Dreams defendants to plead guilty.  At Chong's sentencing, Assistant U.S. Attorney for Western Pennsylvania Mary McKeen Houghton said in her arguments that Tommy Chong "used his public image to promote this crime" and marketed his products to children. U.S. Attorney Mary Beth Buchanan also was present at the sentencing in Pittsburgh and released a statement to the press stating, "there are consequences for violating the law, even if the violator is a well-known entertainer like Thomas Chong."  While Chong argued for community service and home detention at his sentencing, the district judge, Arthur J. Schwab, denied his requests and sentenced him to 9 months in federal prison, a fine of $20,000, forfeiture of $103,514, and the loss of all merchandise seized during the raid of his business. Chong served his sentence at the Taft Correctional Institution from October 8, 2003 to July 7, 2004. He was a cellmate--or "cubie"--with "The Wolf of Wall Street" Jordan Belfort, and is given credit for encouraging Belfort to write his memoirs. They have remained friends ever since.  These events were among those chronicled in a/k/a Tommy Chong (2006), a documentary by Josh Gilbert. It premiered theatrically at the New York Film Forum in New York City and won awards. His time in prison was also a main point in his book, "The I Chong".
Question: who was the prosecutor?. Whats the answer?
Assistant U.S. Attorney for Western Pennsylvania Mary McKeen Houghton