 Together with Roland Hagenberg, he subsequently published the two books "Maler in Berlin" (1982) and the sequel "...Und" (1983) in their own publishing house "HAPPY-HAPPY", which contained numerous interviews and portraits of artists and collectors, among them Anselm Kiefer, Georg Baselitz and Erich Marx as well as representatives of the art groups "Neue Wilde" and "Arte Cifra".With Roland Hagenberg he traveled New York City, where they conducted interviews with Andy Warhol, Robert Mapplethorpe, Keith Haring, Francesco Clemente, Julian Schnabel, Robert Morris, Jean-Michel Basquiat, Leo Castelli, Ileana Sonnabend, Mary Boone, Tony Shafrazi, and many more.