Author: "Verfassungsfragen der Finanzierung von Privatfunk durch Werbung," 1988. Co-Editor and Author: with Stephan Pauly, "Steuerrecht in der anwaltlichen Praxis," 1st - 3rd Edition, 1996-2002; with Stephan Pauly, "AnwaltFormulare," 1st - 7th Edition, 1997-2011. Editor: "Nomos Kommentar, Das neue Schuldrecht," 1st Edition 2001; "Das neue Schuldrecht in der anwaltlichen Praxis," 1st Edition 2001. Co-Editor and Author: "Nomos-Kommentar BGB," 1st-2nd Edition, 2003-2011. Editor and Author: "Aktienrecht und Kapitalmarktrecht," 1st - 3rd Edition, Heidel, 2003-2011. Co-Editor and Author: "Nomos Kommentar HGB," 2011. (Certified Specialist in Commercial, Company and Tax)