David Trexler has been appointed senior vice president of Oncology Commercial at EMD Serono. Mr. Trexler will lead the strategy for the oncology franchise and will be responsible for maximizing growth opportunities by building an oncology team focused on customer and patient centricity.   Mr. Trexler has more than 25 years of experience in branded pharmaceutical marketing, sales and business development. He joins the company from Eisai, Inc., where he served as senior vice president of the Ameri...