Thomas O'Neill was a member of the Wisconsin State Assembly.
O'Neill was born on June 21, 1821, in Dublin, Ireland.
[1] He settled in what is now the City of Greenfield, Wisconsin, in 1847.
[1] On February 12, 1874, in Milwaukee, he married Mary Reynolds, in a Catholic ceremony at St Gall's Church.
[2] O'Neill was a member of the Wisconsin State Assembly during the 1875 [1] session.