Mark Forster is of mixed German and Polish origins. In November 2013, he was featured in the rapper Sido's hit "Einer dieser Steine", singing in the refrain. An even bigger hit for Forster was "Au revoir", this time with roles reversed--Forster listed as primary artist and featuring Sido--with this single being a prelude to the very successful album Bauch und Kopf in 2014. The album was certified gold and included the now-smash-hit "Au revoir" and two other follow-up hit singles, "Flash mich" and the title track "Bauch und Kopf", the latter of which won Bundesvision Song Contest 2015. In 2015 and 2016, Forster served as a coach on German broadcaster Sat.1's German version of the TV competition The Voice Kids alongside Lena Meyer-Landrut and Johannes Strate.