On an April morning in 2010, the future leader of CNN heard a pop in his skull and was suddenly stricken by a vicious headache.
Though he didn’t know it then, Chris Licht, who at the time was executive producer of “Morning Joe” on MSNBC, had a subarachnoid hemorrhage—bleeding in the space that surrounds the brain. Mr. Licht, who on Monday was appointed chairman and CEO of CNN Global, would later write in a 2011 memoir that the mysterious bleed and his eventual recovery put the frenetic world of cable news into perspective.