Simon Köslich studied acting at the Rostock University of Music and Drama from 2006 to 2010. From 2010 to 2014 he was part of the company at the Staatstheater Darmstadt, where he appeared in over 25 plays. He also developed his first own theater projects. 

Since 2014 he lives with his family as a freelance artist in Berlin. He has performed at the Burgfestspiele Bad Vilbel, the Anhaltisches Theater Dessau, TD Berlin and the Bauhaus Triennale, among others.

He attended several camera acting workshops. In the past years he appeared in student film projects at the Film University Potsdam and the DFFB Berlin. He enjoys fine psychological acting, reacting to each other and working on set.