EMD Serono is the biopharmaceutical division of Merck KGaA, Darmstadt, Germany, a global pharmaceutical and chemical group. Their facility in Billerica employs scientists and researchers working in the fields of Oncology, Immunology, Multiple Sclerosis, and other fields to improve the care for patients around the world. Their Billerica facility is their North America center for excellence, and is one of four global research hubs, the others being located in Darmstadt, Germany, Beijing, China, and Tokyo, Japan. These are companies that the town has been recruiting and helping grow.