Kostja Ullmann, born 1984 in Hamburg, entered the stage at the age of eleven and performed at Hamburg"s Ernst-Deutsch-Theater and Winterhuder Fährhaus. In 1998, he made his TV debut in a minor part in the crime series "Alphateam". In the following years, Ullmann starred in several minor roles in TV series such as "Stahlnetz", "Großstadtrevier", and "SOKO Leipzig" as well as in TV movies such as the drama "Albtraum einer Ehe" (2001) alongside August Zirner.

From 1999 to 2000, he was a cast member of the comedy series "Zwei Männer am Herd" with Wolfgang Fierek and Florian Fitz. In 2004, Kostja Ullmann made his movie debut in a leading role in Marco Kreuzpaintner"s award-winning film "Sommersturm" ("Summer Storm"). His performance in the romantic TV drama "Heimliche Liebe" about the relationship of a schoolboy and an older woman won Ullmann the "Günther-Strack-Fernsehpreis" as "Best actor" in 2006. In his second movie, "Verfolgt" (2006), Ullmann stars in a similar role: Directed by Angelina Maccarone, he plays a young delinquent who engages in an "amour fou" with his probation officer who is 30 years older than him. The film won a "Golden Leopard" at the 2006 Locarno International Film Festival.

The years 2007 and 2008 have been among the most productive years of Ullmann"s career. He was seen in eight TV and movie productions, including the ensemble comedy "Stellungswechsel" ("Special Escort ", 2007) and Hans-Christoph Blumenberg"s eagerly awaited comedy "Warten auf Angelina" ("Waiting For Angelina "), also starring Florian Lukas.

For his performance in the television drama "Das Wunder von Berlin" (2008) he is awarded with a Bavarian Television Award as Best Actor. After a small role in "Die wilden Hühner und das Leben" ("The Wild Chicks and Life", 2009) he again plays a lead role in 2010 in "Groupies bleiben nicht zum Frühstück". In the film by director Marc Rothemund he plays an adored pop star who falls in love with a girl that doesn"t even know he"s famous.