HarperCollins
HarperCollins Publishers LLC is one of the world's largest publishing companies and, alongside Hachette, Holtzbrinck/Macmillan, Penguin Random House, and Simon & Schuster, is part of the "Big Five" English-language publishing companies. Headquartered in New York City, the company is a subsidiary of News Corp. Wikipedia*
On the C-SPAN Networks:
HarperCollins has hosted 1 event in the C-SPAN Video Library; the first program was a 2015 Public Affairs Event.