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In 2002, he became the executive vice president of the marketing sector and remained in that position until 2008. In 2009, Jiří was promoted to the Management Board of T-Mobile Germany, where he also held the position of Executive Vice President of Marketing until 2009.

Prior to joining the Telefónica Czech Republic, he held the position of Senior Vice President, International Sales, Marketing and Customer Service, Deutsche Telekom. He joined the A1 team in August 2014 as the President of the Management Board of A1 Croatia.

Jiří Dvorjančanský graduated from the Czech Technical University in Prague and the Grenoble Institute of Technology. He then completed his MBA studies at Thunderbird University in Prague.