Jozef Šesták is a Slovak diplomat, expert on international negotiations in the field of foreign policy and diplomacy.

In 1979, after returning home, he was transferred to the Federal Ministry of Foreign Affairs of ČSSR in Prague, where he worked at the Minister's office.

He served as the Deputy Head of the Czechoslovak Delegation at the disarmament negotiations on Reduction of the Conventional Forces in Central Europe (MBFR) (1983-1988).

Also in 1990, he was the Head of the Delegation of the Czech and Slovak Federative Republic with the diplomatic rank of the Ambassador at the international negotiations on Open skies regime in Canada and Hungary.

As early as during the federative arrangement of Czechoslovakia, he initiated foundation of the Ministry of International Relations in Bratislava, Slovakia to become the first department of the Slovak Diplomacy.

[citation needed] In December 1994, the cabinet of the prime minister Vladimir Mečiar appointed him as the State Secretary of the Ministry of Foreign Affairs of the Slovak Republic (1994-1998).

[citation needed] He has reached an important diplomatic achievement by successful negotiations of the Treaty on Good Neighbourly Relations and Friendly Cooperation between the Slovak Republic and the Republic of Hungary[4] (signed in Paris on 19 March 1995) in which he acted as the leader of the governmental negotiation team of Slovakia.

[5] As the state secretary of the Ministry of Foreign Affairs, he worked also as the Deputy Chairman of the Government Council for the Promotion of Export.

The initiative of Ambassador Jozef Šesták was appreciated by the High Representative for the Common Foreign and Security Policy of the European Union, Mr. Javier Solana, on 25 February 2005.