Costis is the editor of two literary and art magazines published in Athens, “Lotus” and “Praxis”. His first book of poetry was published in 1974 and since 1970, he has been a regular contributor of essays, articles, poems and drawings to many magazines.  In 1975 his first Performance took place at an art gallery in Athens. He has had 30 solo shows in galleries and museums in Europe and has participated in more than 100 international group shows. He has also engaged in a variety of projects and conferences / symposia on art, New Technologies, and poetry.