Wow. The second video is lengthy, but well worth the investment to get past the introductions. Talk about mind expanding!
These are great videos. I was always fascinated with his work. Thank you.
I was privileged to study under Jim and later become his colleague and friend. He was a witty, and gracious person. If anyone wants to read my memories of him, you can find it here: http://gregnewbold.blogspot.com/2017/01/remembering-james-c-christensen.html