EXCLUSIVE: Adrienne O’Riain is leaving the Turner networks after 11 years, most recently as SVP, original programming for TNT, TBS and truTV, serving as co-head of scripted development for the TNets.

There are hardly any other networks that have undergone more disruption over the past nine months than Warner Bros. Discovery’s TNT and TBS have post-merger — and it’s not over. The TNets just saw ...