The de facto national library of the United States of America in Washington, DC, Charged to ``make knowledge and creativity available to the United States Congress,'' and to ``to acquire, organize, preserve, secure and sustain for the present and future use of the Congress and the nation.''

Runs the Library of Congress Classification System used in libraries throughout the world.

http://lcweb.loc.gov/

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Librarians of Congress

John J. Beckley (1802-1807)
Patrick Magruder (1807-1815)
George Watterston (1815-1829)
John Silva Meehan (1829-1861)
John G. Stephenson (1861-1864)
Ainsworth Rand Spofford (1864-1897)
John Russell Young (1897-1899)
Herbert Putnam (1899-1939)
Archibald MacLeish (1939-1944)
Luther H. Evans (1945-1953)
L. Quincy Mumford (1954-1974)
Daniel J Boorstin (1975-1987)
James H. Billington (1987- )

These biographies from:http://lcweb.loc.gov/loc/legacy/librs.html