On April 13, 2020, the Board of Directors (the “Board”) of Mersana Therapeutics, Inc. (the Company) increased the size of the Board from six to seven directors and appointed Martin Huber, M.D., to serve as a Class I director for a term expiring at the Company’s 2021 annual meeting of stockholders or upon his earlier death, resignation or removal. The Board also appointed Dr. Huber to serve as a member of the Board’s Nominating and Corporate Governance Committee. On April 15, 2020, the company announced Dr. Huber’s appointment to the Board. Dr. Huber most recently served as Senior Vice President and Chief Medical Officer at TESARO, Inc. before its acquisition by GSK. While at TESARO, he drove the expansion of the niraparib program and advanced the company’s immuno-oncology agents into the clinic. Prior to that, he was Vice President, Oncology Clinical Research at Merck Research Laboratories where he was the program lead for pembrolizumab in non-small cell lung cancer. Prior to Merck he served in roles of increasing responsibility at Schering-Plough, Hoffmann-La Roche and Rhone-Poulenc Rorer, where he led teams in the areas of oncology clinical development, drug safety and pharma covigilance.