News International's parent company News Corporation planned to launch an aggregated digital news platform for its own newspaper titles and those of third-party publishers, as part of a venture known as Project Alesia.
But the initiative, which was believed to have been overseen in the UK by Clark, , estimated at about £20m.
Clark, who has left News International with no job to go to, said it was "the right time" for him to exit the company. He said: "News Corporation has a lot of interesting projects, but nothing which is right for me right now or for the company."
During his ten years at News International, Clark held a number of senior executive roles, including advertising director of The Sun and senior commercial posts at The Times and The Sunday Times.
However, he is perhaps best-known for his time as managing director of News International's free afternoon paper thelondonpaper, .
Clark started his career on the media agency side of the industry, spending seven years at Arena BLM, now Arena Media, rising to become managing director.
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