He usually works with Michael Argenziano, an affable, bearlike man who is chief of adult cardiac surgery. (Oz trained Argenziano, and they have worked together for years.) I hovered in the background, watching the operation on one of the giant monitors suspended from the ceiling.

NEWYORKER: The Operator

Pandit has experience running a complex investment bank, but little background as the chief of a global consumer operation.

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