A highly regarded scholar of Aristotle (especially his philosophy of biology), Professor Gotthelf was emeritus at the College of New Jersey, and had taught more recently, with support from the Anthem Foundation, at the University of Pittsburgh and Rutgers University at New Brunswick.   His Rutgers page has some information about his work.  (He also (alas!) had a side interest in Ayn Rand–hence the Anthem Foundation support–though being much smarter and a much better scholar than Rand, he was capable of making her work seem more philosophically interesting than it actually was.  He was particularly good at developing NeoAristotelian themes that he claimed to find in her work.)  

UPDATE:  An informative memorial notice.