sentences:  She led the planning of conferences, debates, documentaries, concerts and exhibits; the preparation of books and curricular materials, and the coordination of the UN50 Summit in which l80 Presidents and Prime Ministers participated.Sorensen earlier served from 1978–1990 on appointment by Mayor Edward I. Koch as New York City Commissioner for the United Nations and Consular Corps, head of the City’s liaison with the world’s largest diplomatic community.Her responsibilities included matters related to diplomatic security and immunity, housing and education, and other cultural and business contacts between the host city and over 30,000 diplomats.