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In 2005, the company purchased the manufacturing division of Nortel Networks, and Solectron in 2007.
She is or has been a member of the Board of Directors of Canadian Imperial Bank of Commerce, Nortel Networks, Teck Cominco, Sears Canada, Cadillac Fairview, Bombardier, Rexel Canada Electrical, CanWest Global Communications Corporation, Ontario Power Generation, Ontario Teachers' Pension Plan, Canada Millennium Scholarship Foundation, the Ontario government's Public Accountants Council, and the Hospital for Sick Children Foundation.
Kathleen later achieved executive positions at Baltimore Air-Coil-Pritchard, Merck, and Nortel Networks, and at Nortel achieved the position of director of information services.
Steelbox was founded in 2003 in Atlanta, Georgia by six engineers most of whom have worked together for 20 years and completed projects for Cisco Systems, Scientific Atlanta and Nortel Networks.
After an apprenticeship at British Telecom's research lab at Martlesham Heath, Matthews left Britain and joined MicroSystems International, a chipmaking operation affiliated with Northern Telecom (which became Nortel Networks) in Ottawa, Canada.
In her early career, Gupta worked as an engineer for GTE Lenkurt and later held engineering management positions at Bell Northern Research (now part of Nortel Networks).