Greetings and Welcome to My Home Page!
I am an applied mathematician interested in
the mathematics of physical systems.
My research focuses on the development of
analytical and numerical methods for
differential equations describing these systems.
My current research interest is in the application
of dynamical systems techniques to the Earth's
With my colleague Hans Engler of the Department of
Mathematics and Statistics at Georgetown University,
I recently co-authored a textbook
"Mathematics and Climate," which was selected for the "2013 Choice Award"
by the Atmospheric Science Librarians International (ASLI)
for its "accessible explanations in key areas where
climate and mathematics meet."
I am a co-director of the
"Mathematics and Climate Research Network,"
an NSF-funded network linking researchers across
the U.S. to develop the mathematics needed
to better understand the Earth's climate.
My current academic affiliations are with
Georgetown University in Washington, DC,
where I am Adjunct Professor in the Department
of Mathematics and Statistics, and
the University of Illinois at Urbana-Champaign,
where I am Adjunct Professor in the School of Music.
I am a Fellow of the
Society for Industrial and Applied Mathematics (SIAM),
class of 2009, editor-in-chief of SIAM News,
and a member of the SIAM Committee on Science Policy.
I spent most of my scientific career in the
Mathematics and Computer Science Division
(and its predecessor, the Applied Mathematics Division)
of Argonne National Laboratory.
I retired from Argonne in December 2008 but retain
my affiliation with the laboratory as
Senior Mathematician Emeritus.
I have held visiting positions at several universities
in the U.S. and abroad, and have served
the mathematics community as Program Director
in the Division of Mathematical Sciences of the
National Science Foundation from 2001 until 2008,
with an interruption in 2004-'05.
I reside in Washington, DC.
(Note: The District of Columbia is not a state.
We have no representative in the United States Congress.
This colonial status is based on the U.S. Constitution,
Article 1, Section 8, Clause 17.
"Taxation without Representation.")
My coordinates are given below.