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The entrepreneur was Bryan Johnson, the founder of Braintree. In 2016–2017 reporting, he had committed a reported $100 million to Kernel, a startup pursuing clinical brain-computer-interface research—not a consumer device for sale.
Who was Bryan Johnson, and what did he fund?
Johnson made his fortune at Braintree, the online-payments company that eBay acquired in 2013 for a reported $800 million. He then put a reported $100 million behind Kernel, which he founded to develop technology connecting the brain with computers.
The ambition was to build a platform for recording and stimulating brain activity. That is a much broader goal than building one implant for one task, and the company’s direction changed early in its development.
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How Kernel’s plan changed
The initial idea: a memory prosthesis
Kernel initially pursued a memory prosthesis based on work by neuroscientist Theodore Berger. In the system described in the March 16, 2017, MIT Technology Review profile, researchers recorded memory-related patterns in rats and monkeys, stored the patterns on a computer chip, and delivered them back to the hippocampus. The report said a version had been tried in a handful of people who were already undergoing brain surgery for other reasons; that is not evidence of a generally available implant or a proven treatment.
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The shift: a broader neural interface
Within six months, Johnson said Kernel had abandoned the memory implant as its immediate business entry point. He changed scientific advisers and redirected the company toward a generalized human electrophysiology platform: electrodes would record neural activity and stimulate the brain. Kernel acquired Kendall Research Systems in February 2017 and added Christian Wentz, Adam Marblestone, Caroline Moore-Kochlacs, and Jake Bernstein. Wentz characterized the work as a “15-year endeavor.”
| Direction | What it involved | What the reporting establishes |
|---|---|---|
| Memory prosthesis | Recording patterns associated with memory, processing them on a chip, and delivering them to the hippocampus | Kernel initially pursued this approach; the profile described animal research and a version tried in a handful of people already having brain surgery for other reasons. |
| Generalized electrophysiology platform | Using electrodes to record and stimulate neural activity | Kernel adopted this as its broader direction after dropping the memory implant as its immediate business entry point. |
Why the project was difficult
An electrode can irritate brain tissue, and implanted electrodes may stop working. Even when a device records neural activity, interpreting those signals in a useful and reliable way is a separate challenge. The 2017 account presented these as major obstacles, not minor engineering details.
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Scale was another gap between ambition and capability. The profile described a DARPA program with contracts worth $60 million that were then near announcement. Its target was to record activity from 1 million neurons and stimulate 100,000; the then-current recording record cited in the article was about 200 neurons. Those figures describe a program’s stated target and the capability reported at the time, not a result Kernel had achieved.
Northwestern neuroscientist Konrad Kording cautioned that investors entering neurotechnology could be overly optimistic, saying researchers were “far away from meaningfully understanding the brain.” His point was that the difficulty was not simply making smaller or more numerous electrodes: researchers also needed to understand what recorded activity meant well enough to use it.
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Was Kernel building a product people could buy?
No consumer device or product for purchase is described in the 2017 reporting. Johnson framed Kernel’s work as clinical and for-profit, with possible eventual applications in depression and Alzheimer’s disease. That is a research and treatment ambition, not evidence of regulatory approval, established effectiveness, or availability to patients.
The profile documents Kernel’s plans and direction in 2016–2017; it does not establish the company’s present-day status. It therefore cannot answer whether Kernel later changed course, completed a device, or brought a product to market.
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