Donald Henry Pleasence OBE was an English actor who gained more than 200 screen credits during a career which spanned over four decades. Often typecast as villainous and/or psychopathic characters, Pleasence is arguably best-known for his work in two of cinema's most successful franchises - James Bond and Halloween.
Description above from the Wikipedia article Donald Pleasence, licensed under CC-BY-SA, full list of contributors on Wikipedia.