These positions are located in the Client Support and Special Situations Section (CSSSS) in the Division for Special Activities (DSA) in the Department of Operational Support (DOS) at United Nations Headquarters in New York. DOS was established to provide operational advisory services to operating entities across the Secretariat, including other departments, offices-away-from headquarters, field missions, and regional commissions. DSA oversees a range of specialized or cross-cutting operational capacities. A large part of its responsibilities is to support start-up, surge, transition and liquidation requirements and to exercise authority on behalf of entities to which authority has not been granted owing to a lack of capacity or from which authority has been temporarily withdrawn. The Division also has the mandate to provide crisis preparedness and support at all duty stations. CSSSS works with counterparts across DOS and other United Nations entities to effectively and rapidly support the deployment, establishment, transition and liquidation of client entities. The Section also provides and coordinates essential operational and administrative support to staff and families affected by a critical incident or any other crisis. The Human Resources Assistant reports to Human Resources Officer.