The Bulletin of the Atomic Scientists, the group responsible for the iconic Doomsday Clock, has a new leader at the helm. Alexandra Bell, a nuclear policy veteran with over a decade of experience, has been named its president and CEO.

The Doomsday Clock, a symbolic measure of humanity’s proximity to global catastrophe, recently moved to 89 seconds to midnight—the closest it’s ever been. The clock reflects threats like nuclear weapons, climate change, and emerging technologies. Bell steps into her new role at a critical moment, replacing Rachel Bronson, who led the organization for ten years.

Bell’s background is impressive. She worked on arms control and nonproliferation in the U.S. State Department, playing a key role in the ratification of the New START treaty with Russia. More recently, she led efforts to reduce nuclear risks globally, including discussions among major powers like the U.S., China, and Russia.

In a recent interview, Bell emphasized the importance of learning from history without being held back by it. “It’s vital to listen to the echoes of the past,” she said. “But we must also focus on the urgent challenges of today.”

The Bulletin, founded in 1945 by physicists involved in the development of the atomic bomb, has long been a watchdog for global risks. Under Bell’s leadership, the organization aims to stay relevant in a rapidly changing world. “The Doomsday Clock moving closer to midnight is a stark reminder that every second counts,” she noted.

As the world faces unprecedented challenges, Bell’s expertise and vision could help steer the Bulletin toward impactful action. Her leadership comes at a time when the stakes have never been higher.