Alan C. Greenberg (born 1927), former Chairman of the Executive Committee of The Bear Stearns Companies, Inc
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Among his many collaborations with other directors, Schmidt-Reitwein is notable for his cinematographic achievement in shooting Alan Greenberg's acclaimed 1982 documentary about Jamaica and death of Bob Marley, Land of Look Behind.
There is yet another unverified suggestion in Alan Greenberg's Love In Vain: A Vision of Robert Johnson, that Johnson had a remote relative who lived in Port Chicago, California, which if true would add ambiguity as to which Chicago the lyrics are referring.