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Lawrence Francis O'Brien Jr. was an American politician and basketball commissioner. He was one of the United States Democratic Party's leading electoral strategists for more than two decades. He was Postmaster General in the cabinet of President Lyndon Johnson and chair of the Democratic National Committee. O'Brien was also commissioner of the National Basketball Association from 1975 to 1984, and the NBA Championship Trophy is named after him. O'Brien, son of Irish immigrants, was born in Springfield, Massachusetts. When he was not working in politics, O'Brien managed his family's real estate and worked in public relations.