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Acharya is vice preesident of growth at One Medical, the fastest-growing primary care system in the U.S.

Rachel F. Elson is a former editor-in-chief of Financial Planning.

Smart-beta styles underlie about one in five ETFs globally with an estimated $400 billion under management, and if they plunged, millions of investors would be burned.

French serve as head of beta solutions, the money manager said in a statement.