Michael A. Metzger has joined Mersana Therapeutics, a platform-based cancer therapeutics company, as executive vice president & chief operating officer. 

Metzger was previously a senior member of the business development team at Forest Laboratories, where he led the company's M&A activities. At Forest, Metzger also completed transformative deals with Cerexa and Novexel, which together formed the cornerstone of Forest's hospital antibiotic franchise. Prior to Forest, Mr. Metzger was vice president of corporate development at Onconova Therapeutics, where he was responsible for the company's business development and financial initiatives.