In 2005, Ann Johnson suffered a stroke that left her severely paralyzed and unable to speak. She was 30. At best, she could make sounds like “ooh” and “ah,” but her brain was still firing off signals.

Dr. Mario did not prepare us for this. In a pioneering effort, researchers from UC San Francisco and UC Berkeley, in partnership with Edinburgh-based Speech Graphics, have devised a groundbreaking ...

Almost two decades ago, Serena Williams stepped into the recording studio to debut as a voice actress in the best American ...