1. Thomas O'Sullivan QC was a barrister, Justice of the Supreme Court of Queensland, and member of both the Queensland Legislative Council and Queensland Legislative Assembly.

1. Thomas O'Sullivan QC was a barrister, Justice of the Supreme Court of Queensland, and member of both the Queensland Legislative Council and Queensland Legislative Assembly.
Thomas O'Sullivan was educated at the local state school and at St Mary's College, Ipswich.
In 1873, Thomas O'Sullivan began his legal career in Ipswich, being employed by, and later articled to, Charles Frederick Chubb, Solicitor.
Thomas O'Sullivan was admitted as a solicitor in September, 1878.
In 1915, Thomas O'Sullivan was appointed as a District Court judge, and made chairman of the Central Sugar Cane Prices Board.
Thomas O'Sullivan contested the electorate of Stanley, the seat his father had represented, at the 1899 election, losing to the Ministerialist candidate, Frederick Lord.
Thomas O'Sullivan resigned from the Council in January, 1906 to contest the seat of Warwick in a by-election to replace Arthur Morgan, who had resigned to join the Legislative Council.
Thomas O'Sullivan was appointed Secretary for Public Works in January 1906, serving until February 1907 when he was given role of Agriculture, serving until November 1907.
Thomas O'Sullivan immediately returned to the role of Secretary for Agriculture in 1908, and then in October of that year he was made Attorney-General and remained in the position until June, 1915.
Thomas O'Sullivan resigned in December 1915 to take up his appointment to the District Courts.
Thomas O'Sullivan had been a President of the Queensland Irish Association and the Johnsonian Club and was a member of the Constitutional Club.
Thomas O'Sullivan was accorded a state funeral, which was held at St Stephen's Cathedral and proceeded to the Toowong Cemetery.