I know there were more writers that worked on the title than the ones I'm about to list, but as a general idea:
Stan Lee (1963-1972, #1-110s)
Gerry Conway (1972-1975, #110s-140s)
Len Wein (1975-1978, #150s-180s)
Marv Wolfman (1978-1980, #180s-200s)
Denny O’Neil (1980-1981, #200s-220s)
Roger Stern (1982-1984, #220s-250s)
Tom DeFalco (1984-1987, #250s-280s)
David Michelinie (1987-1993, #290s-380s)
JM DeMatteis (1994-1996, #380s-400s)
Tom DeFalco (1996-1998, #400s-430s)