The company, based in Southfield, is among the nation’s largest certified public accounting and business advisory firms. : The company, based in Southfield, is among the nation’s largest certified public accounting and business advisory firms. The Free Press partnered with Philadelphia-based Energage to determine the Detroit Free Press Top Workplaces, presented by the Better Business Bureau. Detroit Free Press Anne Agius, left, an administrator and Lauren Millard, part of the tax staff at Plante Moran work together in the offices in downtown Detroit on Woodward Avenue on Tuesday, Oct. 23, 2018.