Who where the 1960s heavyweight boxing champions?

Answer 1

ingemar johannson, crossing over from 1959

Floyd Patterson, who regained the title from ingo in 1960

Charles "sonny" liston, who twice knocked out Floyd in the first round (in '62 & '63).

Cassius clay/Muhammad Ali, from '64 till '67 when he was stripped for failure to submit to the draft.

the title fractured from '65 to '67 when ernie terrell held the wba version of the title, till he met ali in a unification.

after ali was stripped the title fractured again....jimmy Ellis won the wba title, and joe frazier won the wbc belt. they met to unify the title in 1970, when frazier won in the fifth, then joe beat a comebacking ali in '71 to cement his claim.