I would think Barry Halper for amassing such a vast and diverse collection (authenticity questions aside), Dr. James Beckett for his collection and his price guides and how that changed the hobby from circa 1980 to 2000, and PSA for introducing the grading system to the hobby, which like it or not, has transformed the way cards are bought and sold the last 10 years.
Also Larry Fritch has to be on there somewhere. Just about everybody has bought something from Larry Fritch at some time in there life.
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