In his autobiographical documentary Fifi Howls from Happiness, Mohasses mentions that he is descended from the Mongols on his father's side and the Qajars on his mother's side.
He returned to Iran in 1964 and participated in Venice, São Paulo and Tehran Biennales. Mohasses directed plays, including Pirandello's Henry IV at Goethe Institute and Ghandriz Hall in Tehran. He also translated books of a number of authors, including Eugène Ionesco, Malaparte and Pirandello.
He stayed in Iran until 1968, before returning to Rome, where he received commissions for statutes to be placed in Tehran. Some of his public works in Iran were destroyed or damaged after the Islamic Revolution, with the artist subsequently destroying all his remaining works in Iran. He occasionally travelled to Iran and died in self-imposed seclusion in Rome in 2010.Wikipedia