MOVING TO FRONT FROM FEBRUARY 17--UPDATED
Professor Slater, a well-known expert on the life and work of Bertrand Russell, died in November from Covid. He taught philosophy at the University of Toronto for more than 30 years, where he was emeritus since 1995. I will add links to memorial notices as they appear. Comments are open for remembrances from those who knew Professor Slater or who would like to comment on the significance of his work.
(Thanks to Mohan Matthen for the information.)
UPDATE: The Toronto memorial notices is here.