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Lonnie G. Johnson has a strong background in research and development, primarily focused on proprietary product development. In 1990, they founded Johnson Research and Development, an independent company specializing in innovative technology. This company has affiliated with Excellatron Solid State, LLC, which focuses on rechargeable battery technology, and Johnson Electro-Mechanical Systems, LLC, which develops thermodynamic conversion technology.

In 2021, Lonnie G. Johnson joined Johnson Energy Storage, Inc. as the Chief Technology Officer. Here, they oversee the development of ceramic battery technology that provides enhanced safety, energy density, and robustness. The batteries have the potential to store up to three times the energy of lithium-ion batteries while maintaining a smaller size and weight. Johnson Energy Storage's batteries utilize ceramic electrolytes, making them safer than traditional batteries that use volatile liquid or gel electrolytes. These batteries are well-suited for harsh environments and can operate at temperatures beyond 150 degrees Celsius (300 degrees Fahrenheit).

Prior to their work in the private sector, Lonnie G. Johnson gained experience at NASA Jet Propulsion Laboratory. From 1979 to 1982, they held various roles, including Power Systems Engineer for the Galileo mission and Fault Protection Engineer for the Mariner Mark II Spacecraft series. Lonnie G. was also an Instrument Engineer for the Mars Observer mission, where they conducted studies on resource allocation and interface requirements for camera and spectrometer instruments.

Lonnie G. Johnson obtained their Bachelor's Degree in Mechanical Engineering from Tuskegee University from 1970 to 1973. Lonnie G. then pursued a Master's Degree in Nuclear Engineering from the same institution between 1973 and 1975. Later on, Lonnie G. Johnson completed their education with a Doctor of Philosophy (Ph.D.) in Science, receiving an honorary degree from Tuskegee University in 2001.