Thomas Rayme Wlaschiha [ 2 ] [ 1 ] (June 20, 1973), better known as Tom Wlaschiha, is a German actor . [ 1 ] Internationally known for playing Jaqen H'ghar in the Game of Thrones series , as well as Sebastian Berger in the TV series Crossing Lines. Wlaschiha was born in Dohna when he was 17 years old and traveled to Agawam, Massachusetts as an exchange student where he stayed for a year, acting in theater and studying English.