CfP commemorative issue of "Theory of Computing Systems" in memory of Alan Selman of ToCS

We are editing a commemorative issue in memory of Alan Selman, former editor-in-chief of the journal Theory of Computing Systems and community leader in computational complexity, who passed away on 22^nd January 2021.
We solicit contributions in the form of new research investigations, technical surveys, and memoirs. A technical contribution may include a section describing Alan’s influence on the authors, both on their academic careers and personal lives.