Since 1977 Lorenz Weinrich was member, 1979 and 1980 vice chair and from 1980 to 1992 chair of the board of the association Gesellschaft für Christlich-Jüdische Zusammenarbeit in Berlin (Association for Christian Jewish co-operation in Berlin) [REF].
In 1986 he was elected as a board member of the Deutscher Koordinierungsrat der Gesellschaften für Christlich-Jüdische Zusammenarbeit and 1987 he was its chair.