When World War II broke out, Wladyslaw Sikorski, the premier of the Polish government in exile, asked Szeryng, who was fluent in seven languages, to serve as his liaison officer and interpreter. Szeryng took these positions and discontinued his studies, although he continued to perform on the violin, giving over 300 concerts for Allied troops all over the world. When he accompanied Sikorski on a mission to Mexico in 1941 seeking a home for 4,000 Polish refugees, the positive reception moved Szeryng so deeply that he decided to become a Mexican naturalized citizen, and did so in 1946. In 1945 he accepted the request (made in 1943) that he head the string department of National University of Mexico.