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William Andrew Dimma, CM OOnt (born August 13, 1928) is a Canadian businessman and corporate director.
Born in Montreal, Quebec, Dimma received a Bachelor of Applied Science degree from the University of Toronto in 1948, a Master of Business Administration degree from York University in 1969 and a Doctor of Business Administration from Harvard University in 1973.
From 1974 to 1976, he was a Professor and Dean of the Faculty of Administrative Studies at York University. He was President of Torstar Corporation and Toronto Star Newspapers Ltd. from 1976 to 1978. In 1979, joined A.E. LePage Ltd. as President and Chief Executive Officer. He was a member of the Board of Governors of York University from 1976 to 1997 and was Chairman from 1992 to 1997.
He has served on 90 boards of directors. He is the author of Excellence in the Boardroom: Best Practices in Corporate Directorship.
In 1996, he was made a Member of the Order of Canada. In 1999, he was made a Fellow of the Institute of Corporate Directors. In 2000, he was made a Member of the Order of Ontario.
In 2016, Dimma sat on the jury panel for the National Business Book Awards.