In 1968, together with Heinz Graaf, he established the architecture firm Graaf-Schweger in Hamburg, which has been known as Schweger Assoziierte Gesamtplanung GmbH since 1997. With offices in Berlin and Munich ASP is currently one of the largest architecture firms in Germany, boasting an international reputation and experience, and has received several awards as well as won many competitions. In collaboration with nps tschoban voss in Berlin, Peter P. Schweger and his Hamburg office are planning the Federation Tower in Moscow, which, on completion in 2009, will be the highest building in Europe.