Ogilvy, the writer. Ogilvy, the farmer. Ogilvy, the spy.

Anyone who works in advertising knows about David Ogilvy. He had worked as a chef, researcher, even a short stint as an amish-styled farmer, before embarking into founding his own advertising agency with only $6000 in his pocket.
At O&M david wrote headlines about Rollce Royce's loud clock, which subtly told us the engine was silent, he introduced the original "most interesting man in the world", which was the man in the Hathaway shirt. He wrote books like Ogilvy on advertising, he dabbled in subliminal advertising by getting a hypnotist to deliver the message but decided against ever running it.

But did you know that David Ogilvy was a British Spy?

David Ogilvy - The Farmer and the Spy.