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June 20, 2026
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Casey Harrell’s journey into brain-computer interface (BCI) research represents a landmark in the restoration of speech for individuals with neurodegenerative disease. Diagnosed with amyotrophic lateral sclerosis (ALS) in his early forties, Casey’s condition gradually eroded his ability to move and speak. By mid-2023, he had lost the capacity to communicate verbally with his then four-year-old daughter. Yet, within weeks of receiving a pioneering intracortical implant, Casey became the first person with ALS to regain fluent, intelligible speech through a neural interface. His story is one of profound resilience, technical innovation, and the restoration of human connection through science.
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Before his diagnosis, Casey spent more than two decades as an environmental strategist, helping shape global corporate accountability campaigns. He began his activism at Duke University in the late 1990s, pressing Nike to disclose factory conditions in its supply chain. His career included senior roles at Greenpeace, where he led initiatives persuading Apple and other technology companies to eliminate toxic chemicals and transition to renewable energy.
At the Sunrise Project, Casey led finance-sector campaigns targeting the world’s largest asset manager to align investment portfolios with climate goals. His work was instrumental in launching the “BlackRock’s Big Problem” campaign, which prompted the firm to integrate climate risk into its investment strategy. Even after his ALS diagnosis, Casey continued his advocacy, telling Bloomberg Green in 2021 that his condition had deepened his sense of urgency: “My diagnosis has put me on the ALS clock… I feel really connected to what others feel around a need to act on climate now, not by 2050, in a real visceral way.”
Casey joined the UC Davis–led BrainGate clinical trial in 2023, becoming one of the first participants to undergo implantation of four intracortical electrode arrays designed to decode speech-related brain signals. Within a month, the system successfully reconstructed his intended phonemes—transforming neural signals into clear, synthetic speech in real time. Unlike earlier prototypes, Casey’s system achieved remarkable stability and accuracy, maintaining performance for hours of continuous use and enabling consistent daily communication. He quickly became what researchers called a “power user,” relying on the BCI for more than 70 hours each week.
Before his surgery, Casey’s speech had deteriorated into indistinct sounds. Following implantation, he regained the ability to converse naturally with family, colleagues, and friends – an achievement he described as “life-changing.” Using an AI-generated version of his own voice, Casey can now participate in meetings, send emails, text his friends, and read bedtime stories to his daughter. “I can simply tell her how much I love her, ” he said, through his neural speech system.
The New England Journal of Medicine study published in August 2024 detailed the technical and emotional significance of this breakthrough, marking a milestone for speech BCIs and establishing a new benchmark for accuracy and daily usability.
Casey envisions a future where speech BCIs become accessible, affordable, and seamlessly integrated into clinical care for individuals with ALS and related disorders. He advocates for patient-centered research, sustained funding for long-term support, and the continued evolution of technology that prioritizes communication as a basic human right. His experience stands as one of the most compelling demonstrations of how brain-computer interfaces can restore not only function—but voice, presence, and belonging.
