Don was always unfailingly kind, and was always insistent that no question was a dumb question — which helped for someone focused on a completely different sector. He would always take a call when I was curious if there was overlap or something I could help with, and was always happy to see you when he happened to be in Greenwich or NY. 

He’ll be missed, both among the entire existing and alumni RSR community, and society in general. The world needs more Dons.