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I can't be of much help but can tell you that it's Charles W. Cobb.  
Cobb was a math professor at Amherst where Douglas  
encountered him during a sabbatical from Chicago.   I recall  that  
Thomas Humphrey wrote a  paper on precursors to the C-D  
function a few years back.  I think that's where I acquired this  
factoid.  I don't recall if there's more on Cobb therein.  The paper  
was probably the FRB-RICHMOND Quarterly Review.   
 
Brian Eggleston 
 
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