On 31st March, 2017, Julian Ventura assumed his duties as Mexico's representative in London after presenting to the Foreign and Commonwealth Office (FCO) copy of his Letters of Credence accrediting him as Ambassador to the United Kingdom of Great Britain and Northern Ireland.

      He also serves as Mexico’s Permanent Representative to the International Maritime Organization, the International Mobile Satellite Organization, International Coffee Organization, the International Sugar Organization, the International Whaling Commission and the International Oil Pollution Compensation Funds (FIDAC for its Spanish acronym).

     Ambassador Ventura has served as Mexico's envoy to China from 2013 to 30th March, 2017. In the Mexican Foreign Service, at home and abroad, he has served as Deputy Foreign Minister for North American Affaires; Deputy Chief of Mission at the Embassy of Mexico in the United States; Director General for Asia-Pacific Affairs; Chief of Cabinet to the Foreign Minister; Alternate Representative to the Organisation of American States; Head of Political Affairs at the Embassy in Cuba and Alternate Representative to the International Organizations based in Vienna, Austria.

     He has authored numerous articles on Mexican foreign policy, with a focus on North American and Asia-Pacific issues.