Dale, who has quit his post as head of More4, was appointed its first chief in September 2004 and was responsible for creating the programme schedule and brand.
Launched in October 2005, More4 went into profit in 2007, a year earlier than expected, said Channel 4.
Dale originally joined Channel 4 in 1998 to lead its documentary team and also helped launch broadband documentary channel 4Docs and the Channel 4 British Documentary Film Foundation.
He commissioned Alistair Beaton's feature-length satires A Very Social Secretary and Tony Blair on Trial, Gabriel Range's Emmy and RTS-winning drama, Death of a President; Nick Broomfield's Ghosts and Battle for Haditha, and Molly Dineen's Bafta-winning documentary, The Lie of the Land.
Channel 4 director of television and content, Kevin Lygo, said: "Peter is responsible for steering More4 from an idea on paper to its current success."
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