QUESTION: biographical information

question / pregunta: 

I am writing a curriculum for volunteers doing service in the Global South and am including some excerpts from popular books about international development. For all sources I try to include information about the author, including dates of birth (and death if applicable). I cannot find the dates of birth for Paul Collier (author of The Bottom Billion) or William Easterly (author of The White Man's Burden). Can you please help me find them?

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