 Seidel's US television debut was as a Guest Star on NBC Universal's police drama ""'s premiere episode in 2010.She starred as FBI Agent Sarah DeSoto in the noir-feature film, "The Hollow" in 2015, and as Sybille Ranisch in "Schmidts Katze" in 2014,.Seidel starred as Sigrid Mueller, the Norwegian wife to rogue Treasury Agent Nelson Van Alden (Michael Shannon) in the HBO TV drama series "Boardwalk Empire" from season 2 to season 5 (2012 – 2015).