I just saw a post on the Delta Green Mailing List that said Keith Herber passed away earlier this morning. If so, I am saddened to hear this news. I always had an affection for his contribution to Call of Cthulhu. In particular, his Fungi From Yuggoth was the first campaign that I ever bought and remains a favourite to this day.
More recently I had the opportunity to review his new book, New Tales of the Miskatonic Valley and that was a pleasure.