Jędrzejewicz was born in Spiczyńce, Russian Empire to Polish parents. As a student at the Jagiellonian University in Kraków, Jędrzejewicz joined Józef Piłsudski's Riflemen's Association. In 1915 he was one of the founders and leaders of the Polish Military Organisation. In August 1915 he brought his "Warsaw Battalion" into the Polish Legions' First Brigade, then fighting in Volhynia. In July 1917, during the Legions' "Oath Crisis", Jędrzejewicz was imprisoned by the Germans. When Poland regained independence in November 1918, Jędrzejewicz began work at the Polish Army's Section II. On 24 April 1920, Jędrzejewicz, now a captain, signed a military convention with Ukraine's AtamanSemen Petlura which paved the way for the Polish Army's 1920 Kiev Expedition. Next he served as Section II chief successively to Generals Kazimierz Sosnkowski and Gustaw Zygadłowicz. In September–November 1920, as a major, he was the Polish Army's liaison officer to allied Belarusian forces. At the conclusion of the Polish–Soviet War of 1919–21, Jędrzejewicz was a military expert with the Polish delegation at the Riga Peace Conference. In 1922–25 Jędrzejewicz directed the Polish General Staff's "East" Department. In 1925 he was promoted to lieutenant-colonel. In 1925–28, he was military attaché and effective chargé d'affaires in Tokyo, Japan. Returning to Poland, he served as director of the Foreign Ministry's Consular Department and as Treasury Vice Minister. On 22 January 1934, he was appointed Minister of Religious Denominations and Public Education in the government of his brother, PremierJanusz Jędrzejewicz, serving on as well in the premierships of Leon Kozłowski and Walery Sławek. He introduced educational reforms that sparked controversy in Poland but won international approval and emulation. After Marshal Józef Piłsudski died, Jędrzejewicz held no more ministerial offices. When World War II broke out in September 1939, Jędrzejewicz helped evacuate the treasury of the Fund for National Defense, which in February 1940 was delivered to General Władysław Sikorski's Polish government-in-exile in Paris. Due to the anti-Piłsudskiite policies of General Sikorski, Jędrzejewicz was prevented from serving now with the Polish Armed Forces in exile. Consequently, in March 1941 he emigrated to New York City. On 4 July 1943, Jędrzejewicz co-founded the Józef Piłsudski Institute of America, dedicated to study of recent Polish history, and was its first director. In 1948 Jędrzejewicz became professor of Russian language and literature at Wellesley College. In 1958-1963 he was director of Slavic studies at Ripon College in Wisconsin. On retiring, he returned to New York, where in 1964 he again became director of the Józef Piłsudski Institute. Jędrzejewicz died at the age of 100 on 30 November 1993, in Cheshire, Connecticut, the last of Marshal Piłsudski's government ministers and the last co-founder of the Józef Piłsudski Institute of America. He was interred on 4 June 1994 at Powązki Cemetery in Warsaw, Poland.
Works
Jędrzejewicz published some 300 scholarly papers in history and several major books, including Poland in the British Parliament, 1939-45 and a two-volume Kronika życia Józefa Piłsudskiego. His English-language publications also included Piłsudski: a Life for Poland, New York, Hippocrene Books, 1982.
