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...
- La carrozza d'oro .... The viscount (uncredited)
1953 - Le infedeli .... Friend of the Rodgers family (uncredited)
- The Man From Cairo / Dramma nella Kasbah .... Roulette player (uncredited)
1954 - Mambo .... Dinner guest (uncredited)
- Pietà per chi cade .... Friend of the Savelli family (uncredited)
1956 - Londra chiama Polo Nord .... Military judge (uncredited)
1960 - La dolce vita .... Man by the door at the party (uncredited)
1961 - Una vita difficile .... Dinner guest (uncredited)
1966 - Se tutte le donne del mondo... .... Guest at the ball (uncredited)
1968 - Diabolik .... Sir Harold Clark (uncredited)
- Tenderly .... Priest officiating the wedding (uncredited)
1970 - Waterloo .... Member of French royalty (uncredited)