The Commission is composed of 40 Member States elected by the Economic and Social Council, with the following distribution of seats among the regional groups:
(a) Twelve for African States;
(b) Nine for Asian States;
(c) Eight for Latin American and Caribbean States;
(d) Four for Eastern European States;
(e) Seven for Western European and other States.
The term of office for Commission Members is three years.
In order to function effectively, the Commission needs to organize and prepare its work carefully and in advance. Such tasks are carried out by the Bureau and the Extended Bureau of the Commission, which play an active role in the preparation of the regular and the inter-sessional meetings with the assistance of the Secretariat.
The Bureau of the Commission is composed of the Chairperson, three Vice-Chairpersons and one Rapporteur. At the end of its reconvened session, the Commission elects its Bureau for the next session. The Extended Bureau also includes the Chairpersons of the five regional groups, the European Union and the Group of 77 and China.
A diplomat since 1976, Jose Antonio Marcondes de Carvalho graduated in Law. Since the beginning of his career, he specialized in regional and economic international negotiations.
During eight years he was the Head of the Regional Integration Department of the Brazilian Ministry of Foreign Affairs. He worked in the Brazilian Embassies of Washington and Havana and in the Brazilian Mission to the UN in New York. He also served as Chief of the Brazilian Representation to FAO and as Brazil's Ambassador to Venezuela.
He was Undersecretary for Environment, Energy and Science and Technology in the Brazilian Ministry for Foreign Affairs and Brazil's chief negotiator for climate change.
Since November 2018, he is the Ambassador of Brazil to Austria and the Permanent Representative of Brazil to the International Organizations in Vienna.