Thomas Arnoldner was born in 1977. He studied business management at the Vienna University of Economics and Business and the Stockholm School of Economics. 

The professional career of Thomas Arnoldner started in 2003 at Alcatel Austria. After several management positions in the company he took over as CEO of Alcatel-Lucent Austria in 2013. From 2015-2016, after Nokia acquired Alcatel-Lucent, he was a member of the integration team and developed the post-integration strategy for the combined company. From 2016-2017, he led Nokia's European growth strategy for several business areas and markets. From 2017-2018 he was a member of the executive board of T-Systems Austria GesmbH. 

Thomas Arnoldner took over as CEO of A1 Telekom Austria Group as of 1 Sept. 2018. Contract Term until 31 Aug. 2023.