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IBM Design Engineer Joe Crespo at Computer History Museum, May 1998.
Crespo worked on the IBM 1620 at IBM's San Jose laboratory.
David Wise is a development engineer with Phoenix Technologies and has the only running IBM 1620 in the world. There is more information on David and his machine here.
Dave Babcock is a systems software engineer whose first computer was the IBM 1620. An active volunteer at Computer History Museum, he is also the creator of this web site.