I have followed Karsten Schwan's work for the last 15 years since he was
at Ohio State. All of his work has been closely aligned with application
needs and is impressive in terms of the many interesting software systems
that he has designed and built -- which systems are then used and tested
using significant large scale applications. His research has focussed on
interactive or real-time systems and I am most familiar with his work on
computational steering Falcon and MOSS where he has constructed a
sophisticated environment which has several important features that
should be part of what would be called a "Computational Portal" or "Grid
Computing Environment". I can highlight one of best uses of CORBA
technology in scientific computing and the use of an agent framework to
help the user in the real time decisions. This work illustrates his
energy (I know this is a mammoth task from my work in this area)
innovation and practical user oriented work. Karsten has been an active
member of the editorial board for the journal "Concurrency: Practice and
Experience". His reviews have been excellent. 
	I believe Karsten is one of the very best computer science system
researchers and he has demonstrated the international leadership required
to be ACM fellow. 
	He has my full support for this honor