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Marc S.Tough question, Jim. There are a few generalists - but there are absolutely some "experts" in different themes of the era [type cards, 19th century, PCL, Zeenuts, etc.]
The first few that come to my mind are:
Keith Olbermann
Lew Lipset
Larry Fritsch [maybe - don't know enough]
Barry Sloate
Leon Luckey
Mark McRae
Jay Miller
And there are many more who I would consider 'experts' on certain sets