Scientist Jack Cohen (b.1933) died on May 6. Cohen primarily worked in the field of reproductive biology.  He was a lecturer of zoology and comparative physiology at the University of Birmingham and later worked for a private hospital in London.  He was a visiting professor at the Weizmann Institute and has taught at the University of Warwick and Durham Business School.

As a science fiction fan, Cohen found himself advising many authors, including Anne McCaffrey, Larry Niven, David Gerrold, Jerry Pournelle, and Harry Harrison.  He teamed with Ian Stewart and Terry Pratchett wrote four volumes in the Science of Discworld series, the first of which earned the three authors a Hugo Nomination for Best Related Book. Cohen and Stewart also wrote other non-fiction books as well as the novels Wheelers and Heaven.