Billionaire steel tycoon Andrew Carnegie credited his entire fortune to his mastermind group – he inspired author Napoleon Hill to create the term in his 1937 book Think and Grow Rich.
Hill spent 25 years interviewing 500 of America’s most innovative leaders, including Thomas Edison, Harvey Firestone, Henry Ford and J. P. Morgan, and many others, to discover their secrets for success.
One thing they had in common, Hill discovered, was participation in a peer group.