Sheena Teshima May 1, 2016 Regular Contributor, PTE Karen Wensley MBA ICD.D Sheena Teshima May 1, 2016 Regular Contributor, PTE Karen Wensley is a special lecturer in business ethics at the University of Waterloo. She was the author of the monthly ethics column for CPA Magazine from 2014 - 2018. She authored the eLearning module on ethics in tax for the InDepth tax course.