Of course Bob Loveless would have to be included. Not only has he influenced many makers since him, he was also the one to bring 154CM to the knifemaking world and if someone was using Micarta before him, I don't know who that might have been.
Sal, if for nothing else but the Spydie hole, would belong on this list.
Michael Walker for the Liner Lock and for his innovative designs.
William Scagel for his still much copied designs, for being the father of modern custom knifemaking and for inspiring Bo Randall to take up the torch.
Bo Randall for inspiring so many of the knives that followed.
Ken Onion for the Speedsafe opening system.
Bill Moran for pioneering the return of pattern welded steel to knifemaking.
Al Pendray for his work with wootz damascus.
Ed Fowler for his continued efforts to produce the best results from steel that he can and his willingness to pass this knowledge on to others.
Daryl Meier for bringing us mosaic damascus.