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Tjalling Charles Koopmans (August 28,
1910–February 26, 1985) was the joint
winner, with Leonid Kantorovich, of the 1975 Bank
of Sweden Prize in Economic Sciences in Memory of
Alfred Nobel.

Koopmans was born in 's Graveland in the
Netherlands. He began his university education at
the University of Utrecht, aged 17, specialising
in mathematics. 3 years later, in 1930, he
switched to theoretical physics. In 1933, he met
Jan Tinbergen, the 1969 Bank of Sweden prize
winner, and moved to Amsterdam to study
mathematical economics under him. In addition to
mathematical economics, Koopmans extended his
explorations to econometrics and statistics.

Koopmans moved to the United States in 1940. There
he worked for a while for a government body in
Washington D.C., where he published on the
economics of transportation focusing on optimal
routing, then moved to Chicago where he joined a
research body affiliated with the University of
Chicago. In 1946, he became a naturalized citizen
of the United States. In 1955, he moved to Yale
University where he continued to publish, now on
the economics of optimal growth and activity
analysis. He died in 1985.

It is remarkable that Koopmans's cousin Simon van
der Meer won a Nobel Prize in Physics in 1984.

==His contributions==
*Koopmans was awarded his Prize (jointly with
Leonid Kantorovich) for his contributions to the
field of resource allocation, specifically the
theory of optimal use of resources. The work for
which the prize was awarded focused on activity
analysis, the study of interactions between the
inputs and outputs of production, and their
relationship to economic efficiency and prices.
*His early works on the Hartree-Fock theory are
associated to the Koopmans' theorem which is very
well known in quantum chemistry.

==External links==
*http://nobelprize.org/economics/laureates/1975/ko
opmans-autobio.html Nobel autobiography
*http://www.boston.com/globe/search/stories/nobel/
1985/1985ao.html An obituary
*http://www.geocities.com/gfh_axds_as/zax/koopmans
-autobio.html  contributions to the theory of
optimum allocation of resources.