Mr. Unruh was born and raised in Manitoba. He attained his B.A. in 1966 and his LLB in 1970 from the University of Manitoba. In 1979, Mr. Unruh was awarded an honorary Certified General Accountant degree.

Mr. Unruh joined Westcoast Energy Inc. as Senior Vice President, Law and Corporate Secretary in 1993 and continued in that role until March 14, 2002. From March 15, 2002 until his retirement on April 1, 2003, he was Senior Vice President and General Counsel for Duke Energy Gas Transmission's North American operations following which from April 1, 2003 to June 30, 2005 he became a non-executive Vice Chair of both Westcoast Energy Inc. and Union Gas Limited. Prior to his move to British Columbia to join Westcoast Energy, Mr. Unruh practiced business law in Winnipeg, Manitoba most recently as a partner of Aikins, MacAulay & Thorvaldson, Barristers and Solicitors.

David Unruh is a director of Union Gas Limited, Ontario Power Generation Inc., Pacific Northern Gas Ltd., Corriente Resources Inc., Canada Line Rapid Transit Inc., The Wawanesa Mutual Insurance Company, The Wawanesa Life Insurance Company, The Wawanesa General Insurance Company and Globe Foundation of Canada.