To JPMorgan Chase & Co. chief executive Jamie Dimon, Treasury and Securities Services is a nuts-and-bolts, "Warren Buffett-style" business with healthy margins, sticky client relationships, and technology, complexity and scale that are difficult for rivals to replicate. Running this $7.3 billion-in-revenue, 27,000-employee enterprise within the enterprise since 2004-until her promotion in June to president, international-has been Heidi Miller, a onetime CFO and Dimon colleague at Citigroup whose career stretches back to 1979.
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