Dan Brooke says Channel 4 needs to be as cutting edge in its marketing as it is in its programming. The broadcaster has started experimenting with targeted campaigns for brands through its 4OD on-demand TV service.Brooke joined Channel 4 in 1998, becoming managing director of digital channels and launching E4, Film4 and More4. He then joined Discovery Networks UK as managing director of its channel portfolio before rejoining Channel 4 in 2011.