Selome Hailu Brooke Karzen is stepping down from her post as executive vice president and head of Warner Horizon Unscripted Television, Variety has learned. She shared the news with staff via a memo on Monday. See the full memo below. Dear Team, I’m reaching out today, so you hear the news from me that I’ve decided to leave my position as Executive Vice President and Head of Warner Horizon Unscripted Television. Leaving Warner Bros. after 22 years was not an easy decision, but the time is right for a change. I will take some time to consider new opportunities and am excited to start a new chapter.