Lonnie G. Johnson grew up in Mobile, Alabama, during segregation. He studied at Tuskegee University, earning a bachelor's degree in mechanical engineering and a master's in nuclear engineering. Tuskegee later awarded him an honorary doctorate.
His professional work included the U.S. Air Force and NASA's Jet Propulsion Laboratory. The National Inventors Hall of Fame records his arrival at JPL in 1979 to work on the Galileo mission, a return to Air Force service in 1982, and another period at JPL beginning in 1987 involving Mars Observer and Cassini. These assignments placed him within large technical teams responsible for complex aerospace systems.
Licensing his inventions also meant making sure he was paid for them. In November 2013, the San Diego Voice & Viewpoint reported that arbitration had awarded Johnson nearly $73 million in unpaid Hasbro royalties connected to Nerf products.
Johnson continued to work on energy technologies through his research businesses. Their projects have included batteries and systems intended to convert heat into electricity. NASA's 2019 speaker biography describes those ambitions alongside his earlier engineering service and explicitly identifies him as African American.
His relationship with Tuskegee also continued. In February 2025, the university and Johnson Energy Storage announced a cooperation agreement to establish a technology research and incubation center bearing his name. The partnership described opportunities for students and faculty to work with industry.
The National Inventors Hall of Fame inducted Johnson in 2022 and also records his STEM Activity Center, which introduces students to scientific and technical work.
The toy's working parts were simple: a pressurized chamber and a valve, arranged so that water left in a long, steady stream. Johnson's energy research has followed a longer course, from jet propulsion laboratories to his own companies, in pursuit of the same practical question: how to store and move energy efficiently.
Johnson's heat-pump work never stopped. The thermodynamics behind a water toy and behind an energy-storage system come from the same physics, and his companies pursue batteries and heat-to-electricity conversion with the same engineering discipline he learned at Tuskegee and applied at JPL.
