De Seynes’ chronological files reflect the organizational changes and administrative arrangements within DESA including coordination between DESA and the regional economic commissions and his responsibilities to the Secretary-General. During his tenure, de Seynes was responsible for overseeing the Bureau of Technical Assistance Operations (BTAO) and the Office of Technical Co-operation (OTC), as well as the substantive offices of DESA including: the Centre for Development Planning, Projections and Policies (CDPPP); Social Development Division; Statistical Office; Population Division; and the Centre for Housing, Building and Planning. S-1931 records contain correspondence; memoranda; cables; and agendas of meetings. A limited number of records also document de Seynes’ 1956 appointment as Under-Secretary in charge of Relief to the Hungarian People with responsibility for coordinating aid and relief efforts for refugees of the Hungarian Revolution.