People: Michael Collier has joined Duff & Phelps as a managing director in Houston. With more than 20 years at PricewaterhouseCoopers, Collier specializes in due diligence in the oil and gas sector.
Firms: Lewis & Knopf, a full-service accounting and consulting firm with multiple locations throughout the state but headquartered in Flint, Mich., is celebrating the 80th anniversary of its founding this year.
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