by the burgeoning League of Nations, which named him in 1921 to set up a Health Organization for the LN in Geneva, Switzerland. The Health Organization is largely regarded as one of the LN's most successful undertakings. Rajchman travelled extensively to fulfill his mandate and notably became fascinated by the need for a quarantine and public health system in China: as such he became adviser to the Chinese government and became intimate with the Chang Kai-shek family and especially with T.V. Soong, the then Minister of Economy and brother of Madame Chang Kai-shek. In 1924, together with Arthur Sweetser (the League of Nations' Press Officer), and the Institut Jean-Jacques Rousseau educators Adolphe Ferrière and Paul Meyhoffer, he founded the International School of Geneva - the first of its kind in the world. In the early 1930s, Rajchman introduced his friend Jean Monnet to China’s finance minister T. V. Soong, thus contributing to the creation in 1934 of the China Development Finance Corporation. Meanwhile, he became known in Geneva for his anti-fascist and anti-appeaser attitudes and actions. He no longer pleased politically the French appeaser director of the League of Nations, Joseph Avenol, who dismissed him from his functions in 1938. Finding himself without a job, Rajchman went to China to help the government prepare their defense against Japan, notably by buying airplanes from the United States. His family moved to France, purchasing a "chateau" in Sarthe, a western region of France. The whole family was there when the Germans invaded France. Rajchman went to see the President of the Polish government in exile, General Sikorski whom he knew personally. Sikorski named him to be in charge of Polish refugees and gave him a letter to take to President Roosevelt asking for US help; he also issued Rajchman a diplomatic passport which was what allowed him to flee France through Spain and Portugal and eventually reach Washington DC. During the war, Rajchman worked on humanitarian issues, but also as adviser to TV Soong in development issues: indeed he was said to have belonged to the famous "Chinese Lobby". Towards the end of the war, UNRRA commissioned him to write a report on how to deal with the drastic state of health conditions once Europe would be freed (notably a typhus epidemic was feared). At the end of the war, the new (communist) Polish government in Lublin asked him to represent Poland