Ponsonby will depart Sky next month to launch a start-up retail business offering digital products and services.
His decision follows the departure from Sky last November of Jon Florsheim, the chief marketing officer. Matthew Anderson, Sky’s communications director, has since taken charge of Sky’s marketing and advertising.
Ponsonby joined Sky in October 2001 from Open Interactive where he was group strategy and marketing director. Prior to this he was a board member at Selfridges.
Sky said details of its new marketing arrangements would be announced closer to Ponsonby’s departure.
Ponsonby was a key figure in Sky's recent advertising review, in which its £75m creative business moved from WPP Group's United London to WCRS.
Last week, Sky launched its first ad campaign through WCRS, its "See, speak, hear" campaign promoting a combined TV, broadband and telephony offer.
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