It is my pleasure to recommend Chris Barrett to be a Los Alamos Fellow
I have known of his work for some time but only studied it in detail
during the D division review two months ago. The results of his work
-- such as TRANSIMS -- are obviously very succesful and "crown jewels"
of D division and Los Alamos. However more importantly I see his ideas
(Sequential Dynamical systems - SDS) as indicative of a new approach
to the class of large scale simulations that are typically performed
by event driven methodologies. The latter -- whether one uses 
optimistic or conservative methgods -- must exhibit limited parallelism
except in special circumstances. Chris's approach on the other hand can
exploit scaling parallelism. I am encouraging DoD and organizations working
with DMSO (defense modelling and simulation office) to carefully examine
Chris's techniques as it should allow several orders of magnitude increase
in performance.
Chris runs an impressive group of enthusiastic talented researchers who
are establishing the underlying mathematical and computer science framework
and have published several interesting papers. 
Chris's work combines large scale software development, fundamental
principles and extraordinary insight and innovation.
He has my full support for the distinguished position as a Los Alamos Fellow.