 During World War II, he remained in Switzerland and worked as a journalist in Basel, where he also founded a film festival named "le Bon Film" with his friend Peter Baechlin.After the war he covered the Nuremberg Trials in 1946 and, along with Ernst von Schenck, provided analytical commentary for the memoirs of Alfred Rosenberg, Nazi Germany's chief racial theoretician, who was executed in October of that year.As a correspondent for the leading French evening paper "Le Soir", Lang also attended a variety of sporting events after reporting on the 1948 Winter Olympics at St. Moritz, especially alpine skiing and cycling.