MOVING TO FRONT FROM SATURDAY, AUGUST 13--UPDATED
Well-known for his wide-ranging work in philosophy of science, Professor Humphreys taught philosophy at the University of Virginia from 1978 until his death, where he rose to the rank of Commonwealth Professor of Philosophy. There is a full list of his publications here, and an obituary is here. I will add links to other memorial notices as they appear.
UPDATE: The UVA memorial notice is here.
(Thanks to Harold Langsam for the pointer.)