DALLAS, July 27, 2011 /PRNewswire/ -- Comerica Incorporated (NYSE: CMA) today announced that Karen L. Parkhill, 45, will be a new Vice Chairman. Parkhill will become a member of Comerica's Management Policy Committee, and will report to Ralph W. Babb Jr., chairman and chief executive officer.<br />Initially, Parkhill will assume administrative responsibilities for the Service Company (includes Information Services, Enterprise Payments, Commercial Lending Services, Corporate Real Estate & Security, and Administrative Services), Corporate Planning and Development, and Corporate Compliance and Financial Intelligence.  Immediately following the filing of Comerica's Form 10-Q for the third quarter 2011, it is anticipated that she will assume the additional role of Chief Financial Officer, succeeding Elizabeth S. Acton, 60, Executive Vice President and Chief Financial Officer, who plans to retire in April 2012. As CFO, Parkhill will assume direct management of Finance, including Accounting, Business Finance, Investor Relations, Treasury and Economics and have responsibility, as well, for reporting fourth quarter 2011 results and for all financial reporting thereafter