Fassianos was born in Athens in 1935. After graduating from the Athens School of Fine Arts, he moved to Paris, France to study lithography at the Paris National School of Arts, where he met several artists and writers.
Fassianos used to design the stage decorations for major classic and modern productions. His art has been exhibited in museums and galleries including in Athens, Paris, and throughout Europe, as well as in Tokyo, New York, São Paulo, and Melbourne.
Fassianos himself relates: “For five years I applied myself to drawing ancient heads and nude models. I can’t say I didn’t learn anything from this – quite the opposite.