Semyon Frank (Moscow 1877 - London 1950) was born into a Jewish family originally from Poland. During his years of study, he received a strong influx of thinkers such as Solovyov, Hegel, Schelling, Plato, Plotino, Nicolás de Cusa and Boehme. In 1912 he formalized his entry into the Orthodox Church and received baptism. After teaching at the universities of Saratov and Moscow, he was expelled from the country by the communist government. His exile began in Berlin; from this time are the spiritual foundations of society (1930) and his main work: The unfathomable. An ontological introduction to the philosophy of religion (1936). The pressure of the Nazi regime forced him to move to Paris in 1938; there he writes Light in the darkness and God with us. After concluding the Second World War, he settled in London, where he wrote his last work, Reality and Man, which appeared posthumously in 1956.