This list of credits for psDooM is in no particular order, save for id
Software coming first.  I'll try to keep it more or less cronological.

id Software: http://www.idsoftware.com

  --For writing Doom in the first place.
  --For giving eager programmers the GPL'd source.

Udo Munk: um@compuserve.com

  --For programming XDoom and maintaining it.

<Everyone listed in Udo's CREDITS file>

  --For helping out with XDoom.

Dennis Chao: dlchao@cs.unm.edu

  --For coming up with the brilliant idea of using Doom for process
    management and wading through the XDoom code to implement it.

Mark H. Hamilton: mark.h.hamilton@gtemail.net

  --For coming up with the psDooM moniker "DooM for Sys A's".

psDooM is currently maintained by:
David Koppenhofer (djk@users.sourceforge.net)