I just learned that he passed a few days ago. He was both a good and great man, devoted to getting us into space. He was the manager of the Boeing SPS study in the late 70s. I knew him both from L-5 and NSS, and from working with him in the 80s when Boeing and Rockwell teamed on a project.

[Update a while later]

Sorry, link is fixed now.

[Update a couple minutes later]

Well, that was fast. This post is already on the first few links at DuckDuckGo.