Born in Prague, he was in Paris when Germany occupied Czechoslovakia in September 1938. He returned to Prague upon the death of his father, but was able to obtain permission to return to Paris as a war correspondent, eventually making his was to the United Kingdom, joining the RAF and working for the Czech government-in-exile. He returned to Prague in 1947, but was arrested the following year by the country's new Communist government because he had served in the British military. Released from prison in 1953, he devoted himself to his writing and to publicizing his father's art, spending most of his life overseas. Living in Paris at the time of the Velvet Revolution, which brought down the communist regime, he returned to Prague, where he died two years later, in 1991.
Apart from his biographical works about his father, Mucha's works have received little attention in English. They include (in Czech):