Leo Klag was born on August 16, 1920 in Berlin, Germany. He grew up in an assimilated family. As a teenager in Berlin, he witnessed the rise of antisemitism in Germany since 1933. He saw the boycott of Jewish stores on April 1, 1933, book burnings and demonstrations on the streets of Berlin. He attended the Olympic Games in 1936. During Kristallnacht, his father and brother were taken away and disappeared forever. Leo fled to Hamburg believing the situation was better there. As it was not the case, he went back to Berlin and hid in a Jewish sports complex until February 1939. At this point, he was so sick that he went to hospital where he met a man who helped him organize his immigration to England. Upon his arrival in England, he was interned in the Kitchener camp where he worked for the War Office in a wireless station, listening to communications between German submarines and their bases. After the capitulation of France, Leo was sent to the Isle of Man with other German refugees. He was then shipped to Canada in July 1940. He was interned in Fort Lennox, on the Ile-aux-Noix. After two years he was free to move to Montreal where he worked in the press business. After the war he moved to the USA for two years then went to Israel for one year. He has been back to Germany several times since the end of the war.