Celldex Therapeutics, Inc. announced the appointment of Gerald McMahon, Ph.D., to the company’s Board of Directors. Dr. McMahon was previously the President and Chief Executive Officer of Kolltan Pharmaceuticals. In addition, the company announced that Richard van den Broek has resigned from the Board due to increasing responsibilities in other endeavors. Prior to joining Kolltan, Dr. McMahon served as Senior Vice President, R&D Oncology at MedImmune, where he oversaw the strategy and investment for the oncologic biologics pipeline.