Terrence Valeski is a seasoned business executive and entrepreneur with extensive experience in the telecommunications industry. He served as the CEO of T-Mobile Czech Republic (formerly RadioMobil) from 2000 to 2011, where he played a crucial role in establishing the company as a major player in the Czech mobile market. Prior to T-Mobile, he held senior positions at various telecommunications companies in the United States. Valeski has also been active in the technology sector as a board member and advisor, notably serving on the board of Brand Embassy, a customer service software company, before its acquisition by NICE Ltd. in 2019.

During his time in the United States, Valeski held key positions at Pacific Bell Mobile Services (now part of AT&T), where he was instrumental in developing early cellular services in California. He also served as Vice President of Marketing and Sales at US West NewVector Group (later acquired by AirTouch Communications), where he led strategic initiatives in the emerging mobile telecommunications market.

In the United Kingdom, Valeski contributed to the development of the mobile telecommunications sector through his role as a senior consultant for various telecom operators during the crucial period of market liberalization and digital transformation in the 1990s. His expertise in market development and customer acquisition strategies helped shape the competitive landscape of the UK mobile market during its formative years.