May 21, 2017 6:35 pm Chief Executives Club: Regeneron Founder, President, and CEO Leonard S. Schleifer Regeneron Pharmaceuticals founder, president, and CEO Leonard S. Schleifer talks about his 28-year-old business. US & World Videos 2:31 Fallen Billerica Police Sgt. Ian Taylor honored at vigil 2:33 Massive fire destroys Randolph apartment building 2:50 Rally held in Boston in support of Jewish college students 2:39 MIT president calls for shutdown of student encampments 0:16 4 people seriously hurt after boat sinks off Cape Cod