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.
William O'Brien (judge)
He was appointed a judge of the High Court of Justice in Ireland in 1882, serving in the Queen's Bench Division until his death in 1899. Even his glowing obituary in the "Law Times" admitted that he had not been highly thought of as a barrister, and it was believed that he owed his appointment to the influence of his friend the Lord Chancellor of Ireland, Sir Edward Sullivan, 1st Baronet, who was almost all-powerful in this sphere. Apart from the Phoenix Park case, his most notable trial was of Patrick Delaney for the attempted murder of O'Brien's colleague James Anthony Lawson. He was a devout Roman Catholic, and notably punctilious in his religious observance. He never married.