ATM appointed Dariusz Terlecki as chairman from December 1, 2015 after the current chairman Tadeusz Czichon resigned. From 2002-2011, Terlecki was a Business Director and member of board at Crowley Data Poland and one of the company's strategic success co-authors, from a commercial as well as strategic point of view. His actions contributed to acquiring new clients, increasing sales and building a strong position in the telecommunications market.

Prior to his appointment, Terlecki was sales director at ADP Poland, where he was responsible for the development of the company in the whole territory of Poland.