Alcalay's diplomatic career includes stints at the
Venezuelan Embassy in Paris as Third Secretary from 1970 to 1971 and as counselor from 1978 to 1979, and in Venezuela's Permanent Mission to the
European Community as Minister Counselor from 1979 to 1983. Alcalay was then Venezuela's Ambassador to Brazil from 1997 to 2000. Alcalay was also elected Chairman of the United Nations Committee on Information that month. He resigned as Venezuela's Ambassador to the United Nations in March 2004 to protest Venezuela President
Hugo Chávez's policies, saying that the actions of
Venezuela's National Electoral Council "rob Venezuelans of the right to effect change through the democratic process", and that Venezuela was being subjected to army and police repression and unacceptable loss of life, and that peaceful protest was no longer possible. Only two days prior to his resignation, he had been appointed Venezuela's Ambassador to London. ==Academia==