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I am writing a paper about the reasons why Patinkin decided that the Pigou 
effect had to be introduced in the Keynesian theory. The Don Patinkin 
Papers in Duke's archives show that he changed his mind on this matter 
between the submission of his Ph.D. thesis in 1947 and the publication of 
_Price Flexibility and Full Employment_ in 1948. They also show that this 
change of mind was prompted by a discussion he had with Milton Friedman and 
Alexander Morrel Henderson, the latter having exchanged a couple of letters 
with Patinkin between 1947 and 1948. 
 
Everybody knows Friedman, but A. M. Henderson would require a short 
biographical note. Alas! I have very few elements concerning his 
curriculum. I only know that he came from Cambridge University (U.K.), that 
he spent some time at the Rockefeller Foundations in New York in 1947 and 
then at Harvard University in 1948, and that he probably met Patinkin at 
the Cowles Commission in Chicago. Does someone know who he was, what he 
wrote and when he was born? 
 
Yours faithfully, 
 
Goulven Rubin 
University of Evry-Val-d'Essonne, France. 
 
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