From 1989 to 1993, he was President of Lorimar Television. Became President of Warner Bros. Television in July 1993. Became President of CBS Entertainment in July 1995. President and Chief Executive Officer of CBS Television since April 1998.,Elected to CBS Corp. Board of Directors in July 1999. In July 2004, was appointed as co-President and co-COO of Viacom.,Served as Chairman of CBS from February 2016 to September 2018.