TORONTO (Dow Jones)--HSBC Securities (Canada) Inc. bolstered its investment-banking operations, hiring John Walker as head of its mergers and acquisitions advisory business in Canada. Walker, a securities lawyer, was previously an investment banker with the mergers and acquisitions advisory group at CIBC World Markets, a unit of Canadian Imperial Bank of Commerce(CM). -By Ben Dummett; Dow Jones Newswires; 416-306-2024; [email protected] (END) Dow Jones Newswires July 08, 2010 15:42 ET (19:42 GMT)