Born in Budapest, Hungary in 1917, Markos earned a scholarship to attend the National Royal Academy of Budapest. He was awarded the Hungarian National Prize of Art in 1942.
Following World War II, he came to the United States and established himself in New York City as a major portrait artist. He painted celebrities such as John Wayne and Pablo Casals. His interest turned to Western art when in the 1960's he moved to Houston, Texas.
His paintings can be found at the Cowboy Hall of Fame in Oklahoma City. Marko was elected a member of the Society of Art of Great Britain. The artist died in 1993.