Christian Lous Lange (September 17, 1869 _ December 11, 1938) was born in Stavanger, Norway, and received the Master of Arts degree from the University of Oslo in 1893. In 1909, he was appointed secretary-general of the Inter_Parliamentary Union, a position he retained until 1933.
Lange's first official connection with internationalism came in 1899 when he was appointed secretary of the committee on arrangements for the Conference of the Interparliamentary Union to be held that year in Oslo.
Lange was involved in the planning of the Institute's building, which was opened in 1905, as well as in the founding of its library the year before.
Lange supervised the reorganization of the Bureau after it was moved from Bern to Brussels in 1909, and in 1914, when Germany overran Belgium, installed the office in his own home in Oslo.