Mike Sheehan leaves his mark on Hill Holliday

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Mike Sheehan drinks Dunkin’ Donuts coffee, black. He eats at Chili’s every other week. He has a life insurance policy from John Hancock, home and auto policies from Liberty Mutual, and multiple accounts at Bank of America.

For Sheehan, chief executive of the Boston advertising firm, Hill Holliday, these are not just consumer choices. They are clients.

Sheehan’s obsession with client loyalty – come to work with Starbucks, and you’re fired! – helped him achieve what many considered a near-impossible feat: putting his own stamp on the agency after succeeding its legendary cofounder and chief executive, Jack Connors. When he steps down as chief executive Monday, he will leave Hill Holliday, the nation’s 14th largest ad agency, on a path toward its best financial year ever.

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