Allison Transmission Holdings, Inc. Adds David Denison to Board of Directors

INDIANAPOLIS--Feb. 14, 2013: Allison Transmission Holdings, Inc. announced today that David Denison has been appointed to its Board of Directors.

"We are delighted that David has agreed to join our Board of Directors," said Lawrence E. Dewey, Chairman of the Board of Directors. "His financial acumen and business perspectives will be of great value to Allison and we look forward to his contributions."

Mr. Denison's initial term will expire at the 2013 annual meeting of stockholders. Mr. Denison will be included as a nominee for re-election at the meeting. The Board also appointed Mr. Denison to serve on the Audit Committee.

David Denison has extensive experience in the financial services industry, most recently serving as President and Chief Executive Officer of the Canada Pension Plan (CPP) Investment Board from 2005 to 2012. He has held senior positions in the investment, consulting and asset management businesses in Canada, the United States and Europe. Prior to his appointment to the CPP Investment Board, Mr. Denison was President of Fidelity Investments Canada Limited.  Mr. Denison earned Bachelor degrees in mathematics and education from the University of Toronto and is a Chartered Accountant and a Fellow of the Institute of Chartered Accountants of Ontario.