He began his successful career in the telecommunications field in 1999, as Sales Director at T-Mobile in the Czech Republic. He served as Executive Vice President of the Marketing Division from 2002 until 2008. He was promoted to the Management Board of T-Mobile Germany in 2009, where he held the position of Executive Vice President of the Marketing Division until 2009.
Before joining Telefonica in the Czech Republic, he served as Senior Vice President of the International Sales, Marketing and Customer Service Division of Deutsche Telekom. He joined the Vipnet team in August of 2014, as President of the Vipnet Management Board, and a Marketing, Sales and Customer Service Management Board member. Jiří Dvorjančanský was born in 1969 in Karvine, the Czech Republic. He graduated from the Czech Technical University in Prague and the Institute of Technology in Grenoble. He completed his EMBA master at the Thunderbird School in Prague.
As of 1 June 2015 he serves as Chief Executive Officer and Chief Marketing Officer of the newly established "Croatia and Macedonia" cluster within Telekom Austria Group.