AT&T's WarnerMedia has tapped former Hulu executive Johannes Larcher to oversee the global rollout of its HBO Max streaming service. Larcher will join the firm in August as head of HBO Max International, reporting to Gerhard Zeiler, chief revenue officer of WarnerMedia and president of WarnerMedia International Networks.He has overseen Arabic language streamer Shahid VIP in his current role as managing director, digital at Dubai-based Middle Eastern media firm MBC Group.