oOh!media CEO Brendon Cook opens up on why he’s leaving the $700m-plus company he started as a “one man band” in 1989; what the skills and style of the new CEO will need; why the market is still missing the critical role for creative in media effectiveness and what the out-of-home industry will look like in 2021 as programmatic operatives eye-off a $100bn trading boom globally in digital screens.