Johnson devised the Super Soaker water gun, that has been the top selling toy in America in 1991 and 1992. Johnson holds a B.S in Mechanical Engineering as well as a M.S. in Nuclear Engineering from Tuskegee University. More recently, he teamed up with with scientists from Tulane University and Tuskegee University to come up with a approach to transforming heat into electricity together with the aim of making green energy less expensive. Two of Johnson’s businesses, Excellatron Solid State and Johnson Electromechanical Systems (JEMS), are developing energy technology. Excellatron is introducing thin film batteries, a fresh generation of rechargeable battery technology. JEMS has developed the Johnson Thermo-Electrochemical Converter System (JTEC), recorded by Popular Mechanics as among the top inventions of 2009. JTEC has potential uses in solar power plants and ocean thermal electricity generation. It converts thermal energy to electrical energy utilizing a non-steam procedure which works by shoving hydrogen ions through two membranes, with important advantages over alternative systems