Mark Ćwiertnia (born 11 January 1984), better known by the artistic name Mark Forster, is a German singer. In 2013, he became the vocalist of a duo cooperation, a musical project named Eff in association with DJ and music producer Felix Jaehn.
Mark Forster is of mixed German and Polish origins. He was born to a German father who was born in Dortmund. His mother, Agnieszka Ćwiertnia, was born in Warsaw, Poland. His mother called him Marek and in his early days as a musician used the name Marek Ćwiertnia. He grew up in Winnweiler, Kaiserslautern (State: Rhineland-Palatinate), Germany. He later moved to Berlin where he developed a career as a singer, songwriter, pianist and composer of jingles for television including for the show Krömer – Die Internationale Show. From 2007 to 2010, he accompanied actor and comedian Kurt Krömer as a pianist sidekick. :)
In 2006, Forster joined the band Balboa as their frontman. He was also in Kurt Krömer's Kröm De La Kröm alongside musician Mitumba Lumbumba and in 2000 was signed to German record label Four Music where he released his albums Karton in 2012. The album was produced by Ralf Christian Mayer and coproduced by Sebastian Böhnisch and recorded in Germany, France and Spain. He toured starting February 2012 with Laith Al-Deen and promoted his album. Two minor singles from the album were released: "Auf dem Weg" and "Zu dir (weit weg)".