Most notably , he served from 1972 to 1976 as Deputy Director of Central Intelligence , from 1985 to 1989 as the United States Ambassador to the United Nations and from 1989 to 1991 as Ambassador to the Federal Republic of Germany during the decisive phase of German Reunification .
He served from 1972 to 1976 as Deputy Director of Central Intelligence , from 1985 to 1989 as the United States Ambassador to the United Nations and from 1989 to 1991 as Ambassador to the Federal Republic of Germany . Other websites .