Meet the 80-Year-Old Whiz Kid Reinventing the Corporate Bond

Is he solving a big problem or creating an even larger one?

McQuown's Sonoma property displays his eclectic tastes, mixing the old and the new.

Joe Pugliese/Bloomberg Markets

John “Mac” McQuown yanks on a chain and hoists open a metal roll-up door with a clang. In a flowery aloha shirt, shorts and sandals, he looks like a retiree with little more on his mind than sipping a mai tai by the pool. But McQuown is actually one of the architects of the modern investing system, and he’s far from retiring, Bloomberg Markets magazine will report in its March issue.

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