Quebecor Media announced Wednesday that Isabelle Dessureault, vice president of public affairs with the company, is leaving the position. J. Serge Sasseville, Quebecor’s vice president of corporate and institutional affairs, will take over Dessureault’s duties. Dessureault will stay with the company in an unspecified capacity. She will transfer her responsibilities to Sasseville between now and the end of May. Dessureault has served at the management level of Quebecor since 2005. Quebecor Media is a subsidiary of Quebecor Inc., whose operations include Sun Media Corp., Videotron and the TVA Group Inc.