Presumably an Englishman, or possibly an American, living in Italy and appearing in various films during the 1950s and 60s. He does not appear to have had any credited roles, but his identity is known thanks to him appearing in two very famous films, Jean Renoir's La carrozza d'oro (1952) and Mario Bava's Diabolik (1968), with his name appearing in a variety of written documents about those films. So far, I've come across four different variants of his last name (Febo Kelleng, Febokelleng, Fedo Keeling and Fredo Keeling) so it's hard to say which is the correct one...
FILMOGRAPHY
- La carrozza d'oro (uncredited) .... The viscount
1953 - Le infedeli (uncredited) .... A friend of the Rodgerses
1956 - Londra chiama Polo Nord (uncredited) .... Military judge
1961 - Una vita difficile (uncredited) .... Dinner guest
1968 - Diabolik (uncredited) .... Sir Harold Clark