In the Godfather III (1979) the "new” boss in NY is Joey Zaza. Anyhow, like always, he seems an acting boss because Mike is considered again the most important person of his Family by the other bosses. When Zaza dies Mike will be boss again, until in 1980 in Sicily, when Vincent is nominated as successor. Will he be the definitive boss?

-Vito Corleone: 1919/1933-1950 (BOSS)
Santino “Sonny” Corleone: 1948 (acting boss)
-Michael Corleone: 1950-1980 (BOSS)
Pete Clemenza: 1955-1957 (acting boss?)
Frank Pentangeli: 1957-1959 (acting boss?)
Michael Corleone...or another person : 1959-1961
Fausto Dominick “Nick” Geraci: 1961-1962
Michael Corleone... or another person: 1962 -?
Joey Zaza: ?-1980
Michael Corleone: 1980-1980
-Vincent Corleone: 1980- ? (BOSS)

What do you think? Yours opinions, please ...