If we're counting rocks, then the answer is John Schutt of ANSMET
(followed closely by Cassidy and Harvey, as Jeff mentioned):
http://en.wikipedia.org/wiki/John_Schutt
http://www.nytimes.com/2007/08/25/sports/othersports/25outdoors.html
He's been doing this since 1980 and probably has personally found
10-20% of the ANSMET collection. The Wikipedia stub doesn't begin to
do this guy justice. Every year he has to make sure some
newbie-lab-scientist-volunteer doesn't do something stupid. In 1988,
I almost lost my snowmobile over a cliff. I parked it, not knowing
that it didn't have a brake. It succumbed to gravity and headed
downhill. John ran after it, tackled it, and prevented it from going
over the edge.
The guy can spot and classify meteorites from 100 meters.
Randy Korotev
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