Head acquisition department German Central Library. for Medicine, Cologne, 1987-1989. Head cataloguing and subject indexing department, subject special University and State Library. of Heinrich Heine University, Düsseldorf, 1989-1994, director, 1994-1999. Director general The National Library Germany, Frankfurt, since 1999.
Chair union conference of university library center of North Rhine Westfalia, Cologne, 1995-1999, member library committee Deutsche Forschungsgemeinschaft, since 1998. Initiator book sponsorship campaign, North Rhine Westfalia. Board trustees Online Library.
Computer Center, since 2005.
1987 - 1989
1989 - 1994