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Sema4: Katherine Stueland, Eric Schadt

As part of its acquisition of GeneDx from Opko Health, Sema4 has named former GeneDx President and CEO Katherine Stueland as its new CEO. She replaces Sema4 Founder Eric Schadt, who now will serve as president and chief R&D officer. This represents a change from previously announced plans for Stueland and Schadt to share the CEO role. Stueland had joined GeneDx last year after serving as chief commercial officer of Invitae.