Marcus Hausham Rosenmüller, born in 1973 in Tegernsee, began a course of study at the Münchner Hochschule für Fernsehen und Film (HFF, Munich Academy for Television and Film) following his Abitur. Before graduating in 2003, he had already called attention to himself with his short films: "Hotel Deepa", "Kümmel und Korn" (Caraway and Corn), and "Nur Schreiner machen Frauen glücklich" (Only Joiners Make Women Happy), which were shown at various international festivals and awarded miscellaneous audience prizes.

Following his studies, Rosenmüller produced multiple episodes of the documentary series "Irgendwo in Bayern" (Somewhere in Bavaria) for Bavarian radio; he co-directed one such episode, "Den Frieden in der Hand" (Peace at Hand), with Joseph Vilsmaier. With the award-winning Bajuwaric comedy "Wer früher stirbt ist länger tot" (He Who Dies Earlier is Longer Dead), about a boy from small-town Upper Bavaria who dreams of attaining "immortality" as a rockstar, Rosenmüller makes his 2006 feature-film debut.

With "Beste Zeit", a charming coming-of-age story about the friendship of two teenage girls, Rosenmüller achieved another critical success. Less than a half year after the film"s premiere, the sequel "Beste Gegend" was completed.