Robertson is now effectively the boss of Michael Baulk, the chairman of BBDO Europe. But, 20 years ago, it was a different story, when Robertson, a graduate trainee at Ogilvy & Mather, first rubbed shoulders with the agency's then managing director, Baulk.
While many might quail at the prospect of talking to one so much further up the management chain, the gregarious Robertson made no secret of the fact that he was a fan of Baulk's sleek Ferrari.
One day, Robertson, whom Baulk remembers as "confident and self-assured", found out that some shrewd financial investment meant he'd come into a pile of cash.
The cheeky Robertson, having fleetingly ruminated on what he should do with the loot, went to consult his learned friend. "He said: 'What should I do with it? I'd really like a Ferrari'," Baulk says.
What could one do after such a ballsy request but offer to sell the goods, so in no time Baulk had handed over the keys. "It was a great signal of things to come," Baulk says. "He may have risen to the exalted rank of president, but it doesn't come with a Ferrari."