Warner Bros. Animation president Sam Register to depart after 18 years

Sam Register, who has run Warner Bros. Animation for the better part of two decades, is leaving the studio when his contract expires next week, the company confirmed Tuesday. Warner Bros. Television Group chair Channing Dungey told staff in an internal memo that she and Register had "mutually agreed" not to renew his deal, ending an 18-year run in which he built the studio into one of the industry's most durable animation houses.

Register's exit closes out a tenure that began in 2007, when he joined Warner Bros. Animation as a producer, and expanded steadily until he oversaw not just the flagship studio but Cartoon Network Studios and Hanna-Barbera Studios Europe as well. No successor has been named. In the interim, Matt Matzkin will continue running business operations while six creative department heads keep their respective slates moving.

A studio built over two decades

Register became executive vice president of creative affairs at Warner Bros. Animation in 2008 and was named president in the years that followed, eventually adding Cartoon Network Studios to his portfolio in 2020 and co-leadership of Hanna-Barbera Studios Europe the following year. Under his watch the studio produced "Teen Titans Go!," which has run past 450 episodes, along with "Harley Quinn," the "Animaniacs" revival, "Young Justice," "Primal" and, more recently, "Batman: Caped Crusader" and "My Adventures With Superman." He had also pushed the studio's output beyond Warner Bros.' own platforms, licensing series to Disney+ and Prime Video, according to reporting by Variety and the Hollywood Reporter.

Before joining Warner Bros., Register spent more than a decade at Cartoon Network starting in 1994, where he built the network's first website and helped develop series including "Ben 10" and "Chowder." That background made him, by the account of trade outlets covering his exit, one of the few executives with an unbroken line to the launch of Adult Swim in 2001 and the network's subsequent expansion into adult animation.

The work drew recognition well before his exit. Register has collected Daytime and Primetime Emmy nominations across parts of three decades, dating to a pair of Daytime Emmy nods for outstanding special-class animated programming in 2008 and 2009 and continuing through Primetime nominations for short-form animated programs in 2017, 2018 and 2019. His name has also carried into the fiction his studio produced: a character loosely modeled on him, Dr. Samuel Register, appears in the "Teen Titans" comics that inspired the animated series he later oversaw.

None of that history changes the practical reality facing the studio now. Register's departure removes an executive who had served, in effect, as the connective tissue between Cartoon Network's cable-era programming and Warner Bros. Animation's current streaming-driven slate.

Corporate upheaval in the background

The departure lands as Warner Bros. Discovery works through one of the more complicated corporate transitions in the industry. The conglomerate has said it intends to split into two separate publicly traded companies, Warner Bros. and Discovery Global, a process the company's newsroom has said it expects to complete by the middle of 2026. Warner Bros. Television Group, which houses the animation studio, is slated to sit inside the streaming-and-studios entity that keeps the Warner Bros. name, alongside HBO, HBO Max and Warner Bros. Motion Picture Group.

That restructuring has already unsettled corners of the television business, and animation in particular has absorbed repeated rounds of consolidation and cost-cutting across the industry over the past several years, from cable-network cutbacks to reduced series orders at competing studios. Register's exit was described by trade reporters as amicable rather than a casualty of layoffs, but it nonetheless removes one of the more stable hands in the business at a moment when the parent company's ownership structure itself remains unsettled, with continued speculation about outside interest in Warner Bros. Discovery's studio assets.

A search for continuity

For now, Warner Bros. Animation's day-to-day work continues under its existing bench. Matzkin stays on to run business operations, while creative department heads — including Jay Bastian on current series, Jason DeMarco overseeing anime and action programming, and Audrey Diehl on kids and family content — will keep their divisions running while the company searches externally for a replacement. Shows already in production, among them "Creature Commandos," "Adventure Time: Side Quests" and "Regular Show: The Lost Tapes," are expected to proceed on their existing schedules, according to the studios covering the announcement, including TheWrap and trade publication Animation World Network.

The people most immediately affected are the writers, directors and production staff working under those department heads, many of whom depend on a stable executive structure to greenlight seasons and set budgets years in advance. Animation productions typically run on longer lead times than live-action television, meaning any prolonged vacancy at the top could eventually ripple into decisions about which projects move forward once a permanent successor is in place. For now, the studio has given no indication that any series currently in production or already ordered will be affected by the leadership change.

Register framed his own departure as a personal choice rather than a forced one. In a statement distributed alongside Dungey's memo, he thanked the teams he had worked with over nearly two decades.

"It's been an amazing ride and I want to extend my sincere thanks to all the great people I've worked with — we've built some incredible things together," Register said, adding that he was "excited to explore all the possibilities" ahead.

Dungey, for her part, credited Register with "enormous contributions" to the studio's output, according to Deadline's account of her memo, while stopping short of detailing what prompted the timing of the non-renewal.

What happens next

Warner Bros. Animation has not set a public timetable for naming Register's successor, and the company has not said whether it will look inside its existing creative ranks or hire from outside the studio. Given the scale of Warner Bros. Discovery's pending corporate split, any new hire will inherit not just a large content pipeline but also uncertainty about how the animation unit will be positioned once the company separates into its two successor entities later this year. Register's last day falls when his current contract lapses in early September, according to the company's own account of the timeline, closing out a run that spanned the launch of Adult Swim, the rise of streaming and, most recently, a corporate reorganization whose full shape has yet to be finalized.