Who Am I

I was born on the 30th March 1905 in England and died aged 87 on 10th July 1992.
During my life I executed more than 400 people including William Joyce (Lord Haw Haw)
My first execution was on 29 December 1932 in Mountjoy Prison in Dublin where I was an assistant to his own Uncle.
My life as the subject of a 2005 film.
Anagram
16th, 4th, 12th, 10th, 11th, 15th,(9th-1),5th,(8th-1)(3rd+5)