In this interview, Günther Eichhorn1recalls the history and describes the activities of the “Astrophysics Data System” (ADS 2) that has become the central facility of bibliographic research in astronomy, from the initial concept of a system that allows access to NASA data, through the first implementation of a proprietary software system, the move to the World Wide Web, to the current implementation of a comprehensive Digital Library with extensive links to other on-line information.