Background
He was born in Parkes to carrier William O'Brien and Bridget, née O'Sullivan.
politician Member of the New South Wales Legislative Assembly
He was born in Parkes to carrier William O'Brien and Bridget, née O'Sullivan.
He worked as a cabinetmaker and in the railways, and was an official in the Furniture Trades' Union, being a delegate to and later president of the Trades and Labor Council. In 1917 he was elected to the New South Wales Legislative Assembly as the member for Annandale, transferring to Murray with the introduction of proportional representation in 1920. O'Brien served until 1925.
He died at Leichhardt in 1953.