I gave one of the lectures at the workshop on Algebraic Groups, Lie Algebras and their Representations held at the Max Planck Institute (Bonn, Germany) to celebrate the 70th birthday of Jens Carsten Jantzen.

I’ve known Jens Carsten since I was a graduate student – he was on the faculty at the University of Oregon before he moved to Århus in (roughly?) 1995, and I was a Ph.D. student at Oregon (I finished in 1996). It was very participate in this workshop celebrating his birthday!