Klein, Richard G.
<p>Jun 11, 2013 11:17 PM paleoanthropol.  born 1941.
 
 His primary thesis is that modern humans evolved in <a href="http://en.wikipedia.org/wiki/East_Africa" title="East Africa" >East Africa</a> some 100,000 years ago and, starting 50,000 years ago, began spreading throughout the non-African world, replacing archaic human populations over time. He is a <b>critic of the idea that behavioral modernity arose gradually over the course of tens of thousands</b>, hundreds of thousands of years or millions of years, he instead supports the view that modern behavior arose suddenly in the <a href="http://en.wikipedia.org/wiki/Upper_Paleolithic" title="Upper Paleolithic" >Upper Paleolithic</a> revolution around 50,000 or 40,000 years ...
 
goes to s africa every year to study hunter gatherers.
 
the great leap forward.
 
Stfd Prof: Dept Anthro...
 
studied ancient sites since 1969.
 
focus:  behavioral changes tha allowed modern humans to
spreak to Eurasia by 50K yrs ago where they swamped or replaced Neaderthas.
 
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