Patheon’s president of North American operations, Peter T. Bigelow, will leave the company effective November 1, 2011 to pursue new opportunities.    “Patheon has benefited immensely from Peter’s leadership and is pleased to announce that Peter has agreed to enter into a consulting relationship with the company for a certain period of time to ensure a smooth transition as we continue to focus on the transformation,” said Jim Mullen, Patheon’s chief executive officer...