The Natural Sciences Sector, with a staff of around 200 people in UNESCO Headquarters and Field Offices, is headed by the Assistant Director-General for the Natural Sciences, Ms Gretchen Kalonji.

Programmes and activities are implemented through UNESCO Headquarters and the UNESCO Field Office network.

Four Divisions and the Secretariat of the UNESCO Intergovernmental Oceanographic Commission compose the Sector.

Twenty-three of UNESCO's 56 field offices have a representative of the Natural Sciences Sector.

There are five regional UNESCO offices for science:

• Nairobi (Africa);
• Jakarta (Asia and the Pacific);
• Venice (Europe and North America);
• Cairo (Arab States); and,
• Montevideo (Latin America and the Caribbean).