Jonathan Harris (born Jonathan Daniel Charasuchin; November 6, 1914 – November 3, 2002) was an American character actor whose career included more than 500 television and film appearances, as well as voiceovers. Two of his best-known roles were as the timid accountant Bradford Webster in the television version of The Third Man and the fussy villain Dr. Zachary Smith of the 1960s science-fiction series Lost in Space. Wikipedia