Jan K. Kasprzak, 95, a Polish diplomat before World War II who later served 13 years as an information specialist at the Library of Congress, died of pneumonia Jan. 23 at Northern Virginia Community Hospital.

Dr. Kasprzak retired from the Library of Congress in 1969. In retirement, he wrote articles and books on Russian history.

Dr. Kasprzak, a resident of Arlington, was born in Czestochowa, Poland, and received a doctorate in European history at the University of Warsaw.

From 1920 to 1922, he served in the Polish army during the Russo-Polish War. He received the Polish Freedom Cross for that service.

Later, as a diplomat in the Polish Foreign Service, he was first secretary at the Polish Embassies in Romania, Turkey and Portugal. During World War II, he was an officer of the Free Polish Government in exile in London.

He came to the United States after the war and taught Russian history at Alliance College in Pennsylvania and at Fordham University in New York.

Later Mr. Kasprzak was a translator and commentator for Radio Free Europe. In 1956, he came to the Washington area and joined the staff at the Library of Congress.

Survivors include his wife of 61 years, Sophie Kasprzak of Arlington; two sons, Mark Kasprzak of Arlington and John Kasprzak of Alexandria; two grandchildren; and three great-grandchildren.