Arnold Schwarzenegger, the movie star-turned-California governor, has been interested in business since long before he was Conan or the Terminator. For more than four decades, his behind-the-scenes partner has been Paul Wachter, whose Main Street Advisors was born 25 years ago, with Schwarzenegger's encouragement.The modern multihyphenate -- think LeBron, Drake, Billie Eilish -- are following a template the pair established in the 1980s, as Schwarzenegger successfully expanded his popularity and wealth through savvy dealmaking. The key element: Don't just endorse when you can own a piece of the product.

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