I read this news with great sadness. Just the other day I was thinking that I hadn't seen Mark post in a while.
I was lucky enough to meet him back at the first Bluming seminar years ago with Toby, Aaron, Joe, Neil, Doug and the gang.
I got to spend some driving time and chatting time in the wee hours before sleep took us. We've e-mailed and PM-ed off and on for years since then.
Mark's views helped shape how I view Judo today.
Rest in Peace, sensei. Tonight keiko will be in your honor.