Brook, Channel 4's director of strategy and marketing, leaves as the channel shakes up its business with up to 200 redundancies and a new-look schedule. Brook is leaving to launch a brand and content development business.
Since joining Channel 4 five years ago, Brook has overseen its advertising as well as working on wider development and launch strategies. He is known for his approach of building a "virtual" creative resource using different agencies and 4Creative, Channel 4's in-house resource.
He was also behind Channel 4's successful bid for the Test cricket rights and its involvement in the racing channel Attheraces.
Before joining Channel 4, Brook was the marketing director at Channel 5 for its launch. He spent 18 months there and worked with talent including Michaelides & Bednash and Robert Saville, who used the Channel 5 launch creative to help launch Mother. He was also previously the marketing director for The Guardian and The Observer newspapers.
Brook's initial responsibilities at Channel 4 covered consumer marketing and all on-air promotions as well as steering the broadcaster into new areas. However, last year Channel 4 reduced investment in 4Ventures, which develops interactive and digital content, as well as E4 and FilmFour.
Soon after joining Channel 4, Brook hired Polly Cochrane, a fellow Channel 5 marketer, to head its marketing. She is now the managing director of marketing and 4Creative.