Howard Averill's departure after four years as CFO is part of AT&T's effort to put its own management structure on its new acquisition.
The hit superheroine movie supercharged the company's earnings, with net profit up 11.6% and revenue up 5%.
The Harry Potter spinoff has grossed more than $800 million at the global box office, fueling a 17% increase in Warner Bros. revenue.
The deal will make Time Warner channels available to viewers who have been cutting the cable and satellite TV cord.
But Jeff Bewkes did acknowledge that the media powerhouse is feeling some heat from the uberactive M&A climate.
