William O'Brien (American football)
William Edward O'Brien (March 11, 1923 – December 1, 2000) was an American football coach and official. He was the seventh head football coach at the Southern Illinois University Carbondale, serving for three seasons, from 1952 to 1954, and compiling a record of 6–20. O'Brien was an official in the National Football League (NFL) for 18 seasons, from 1967 through 1983, officiating in Super Bowl X in 1976. He wore number 83 for the major part of his NFL career. He was also a professor at Southern Illinois University.
John William Alexander O'Brien
Major General John William Alexander O'Brien, (13 June 1908 – 27 May 1980) was a senior officer in the Australian Army during the Second World War. He was awarded the Distinguished Service Order for his service as commander of the 2/5th Field Regiment during the Syria–Lebanon Campaign. As Deputy Master General of the Ordnance he was involved in the development of the short 25-pounder and the Owen Gun. After the war he was the Australian supply and defence production representative in Washington, DC from 1951 to 1954, and the Mayor of Woollahra from 1971 to 1972 and 1975 to 1976.