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Finnish government agency Business Finland has published a guidebook that offers advice to companies on how to do business with Nato.

Today, in addition to his guidebooks and tour company, he has a radio show, a YouTube channel with nearly 2 million subscribers, and an array of advocacy projects.

Mr. Frommer was selling 300,000 copies of his guide every year by the mid-1960s; by some contemporary accounts, they represented a quarter to a third of all European guidebooks sold in the United States.

"And he pushes the boundaries. I mean, we had a guidebook on what you could say on social media."

It weaves together science and medicine, psychology and spirituality, as well as financial advice in a research-based guidebook that’s brimming with actionable steps.