https://www.reuters.com/article/us-att-warnerbros-television/former-abc-executive-to-become-chairwoman-of-warner-bros-tv-idUSKBN27427C >Former ABC network executive Channing Dungey will take over as chairwoman of Warner Bros. Television Group, the AT&T Inc unit said on Monday, replacing veteran television executive Peter Roth, who will step down next year.