
The outspoken marketer, who joined William Hill in 2010 from Yahoo, was a member of William Hill’s senior executive team and was instrumental in doubling the market capitalisation of the business and in its re-entry into the FTSE 100 for the first time in seven years.
Fahy joins Telegraph Media in April as chief marketing officer, when he will become a member of the publisher's senior executive team and will report to chief executive Murdoch MacLennan.
Before joining William Hill, Fahy was Yahoo’s vice-president of international marketing until his .
He has also held roles including brand marketing director for Blackberry and has a number of marketing posts at Orange.
MacLennan said: "Kristof has a proven track record of digital marketing across a range of industries. He will be a great asset to the fantastic team here at the Telegraph."
Fahy is a well known figure on the conference circuit, with a reputation for making blunt and often contentious comments.
At BrandMAX in December, he told brands not to over-complicate content and measurement by ; while he told an audience at Marketing’s Mobile 2014 conference to .
He was one of the marketers to at the end of last year.