High Quality Content by WIKIPEDIA articles! Clara Langhorne Clemens Samossoud, formerly Clara Langhorne Clemens Gabrilowitsch (June 8, 1874 – November 19, 1962), was the daughter of Samuel Clemens, who wrote as Mark Twain. She was a contralto concert singer and, as her father`s only surviving daughter, managed his estate and guarded his legacy after his death.