He is married to actress Guðlaug María Bjarnadóttir and they have three children. He studied interior design in Copenhagen and litterature and theatre in Copenhagen and Strasbourg from 1965 til 1972. Símonarson mainly writes for the stage and is one of the most respected and popular dramtists in Iceland. He is a very versitile writer having also written numerus novels, colletions of short stories and poetry, children and youth books. His songs and lyrics for children have been been released on records and CD´s and are sung in every kindergarten in Iceland.