Sad news on both accounts.
I met Aaron at Origins '83 in Detroit, back when he was editor of Space Gamer. I think he ran the Car Wars tournament that year, seeing as he'd just finished Autoduel Champions and Sunday Drivers the year before. Nice guy, great sense of humor. Ghostbusters International is my favorite of his works.
I had the pleasure of playing original white-box D&D with Dave at a small local convention in Rochester, Michigan many many years ago. I still consider it a badge of honor to have been whacked (along with 60% of the rest of our party) by one of Dave's particularly fiendish traps. Terrific GM, he is.
“In our every deliberation, we must consider the impact of our decisions on the next seven generations.”
-- Great Law of the Iroquois Confederacy