Hengeler Mueller is a German law firm of about 240 lawyers, 86 of whom are partners. The firm maintains offices in Berlin, Düsseldorf, Frankfurt am Main, Munich, Brussels and London. The firm was created in 1990 when Hengeler Kurth Wirtz (founded 1901 in Düsseldorf) and Mueller Weitzel Weisner (founded 1947 in Frankfurt) merged.