Another great super investor was Phil Carret.
Warren had great respect for Carret. I think both Fisher and Carret along with Munger shaped the way Buffett invests.
Before the three, he was looking for the butt-end of companies that still had that last puff in them until he realised that its better to pay a premium to get quality rather than not. And then See's Candy became a wholly owned sub of Berkshire Hathaway.