<p>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.</p><p>For Sheehan, chief executive of the Boston advertising firmHill Holliday, these are not just consumer choices. They are clients.</p><p>"You cannot be good in this business," he said, "unless you experience your clients on a daily basis.''</p><p>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. In the decade since Connors handed over the reins, Sheehan has led the agency through technological changes and the worst recession in 70 years and managed to build an even stronger firm in the process.</p><p><a href="http://www.bostonglobe.com/business/2013/05/11/mike-sheehan-leaves-his-mark-hill-holliday/AkyNnGD7PtXkv720QsKoPO/story.html">Keep reading...</a></p>