• UN Secretariat Campus - NY
  • Accountability and Transparency
  • UNHQ HVAC Shop
  • Environmental Management
  • Technology and Innovation
  • Supply Chain Management


UN Operational Support

The Department of Operational Support (DOS) provides operational support to all UN Secretariat entities, including advisory, operational and transactional support services and, where needed, exercises delegated authority on behalf of clients. DOS supports the entire UN Secretariat, consisting of almost 100 entities located around the globe.





Strategic Foundations

Strategic Foundations

The Department for Operational Support was established on 1 January 2019 as part of the Secretary-General's Management Reform. DOS plays a key part in supporting a United Nations that is more agile, effective, transparent, accountable, efficient, pragmatic and decentralized to better support its organizational and operational activities.

Organizational Structure

Our Structure

The Department of Operational Support is based on five pillars - three offices and two divisions - in addition to the Office of the Under-Secretary-General. Approximately 1200 civilian staff work in UN Operational Support at the UN Headquarters, supporting operations globally.

DOS Leadership

Meet our leaders

The Department of Operational Support is currently led by Under-Secretary-General Mr. Atul Khare. The Department has two Assistant-Secretaries General: Ms. Lisa M. Buttenheim for Support Operations and Mr. Bernardo Mariano Jr. for Information and Communications Technology; and one Acting Assistant-Secretary General: Ms. AnneMarie van den Berg for Supply Chain Management. All had long senior careers with the United Nations and bring to their positions vast operational, political and diplomatic experience.