Mr. Callahan received his education in the public schools of Jersey City, N J. Subsequently be moved to Harrison, Hudson County, where he has been for many years a prominent and influential citizen and one of the leaders of the Democratic party. For a time he was the Keeper of the Penitentiary at Snake Hill, Hudson County, and for two terms served as a member of the Board of Aldermen of Harrison. He is now serving as Chief of Police of that city. Mr. Callahan has filled every position with ability and satisfaction and is known as a man of integrity, public spirit, and patriotism. He is a member of the Knights of Columbus, of the Ancient Order of Hibernians, of the Royal Arcanum, and of the Davis Association.