He is famous for two books of autobiographical memoirs Eleni and A Place for Us. The first describes the life of his family in Greece during the Second World War and Greek Civil War. The second relates their experiences as immigrants in 1950s America in the city of Worcester, Massachusetts.
"Eleni", which has been translated into 32 languages, was awarded first prize by the Royal Society of Literature of Great Britain and was nominated in the category of best biography by the National Book Critic's Circle. In 1985, it was made into a feature film starring John Malkovich as Gage.
His most recent book is "Greek Fire", an account of the relationship between Aristotle Onassis and opera singer Maria Callas.
Mr. Gage is the honorary President of the World Council of Epirotes and a recipient of The International Center in New York's Award of Excellence. He continues to speak throughout the world and writes for such publications as The New York Times and Vanity Fair.
Gage also worked as an Investigative Reporter for a number of years. During this period he covered the mafia. After his work with the mafia, he wrote a book, "The Mafia is not an Equal Opportunity Employer." The book covered the origin of the mafia and a history of the American mafia until 1970. It has since been revised and is now called "Mafia, USA."
He is also credited as an executive producer of Francis Ford Coppola's The Godfather III.