Leonard Reiffel (September 30, 1927 – April 15, 2017) was an American physicist, author and educator.
Born in Chicago, Reiffel was an electrical engineering student for a number of years before entering into research fields.
He collaborated with Enrico Fermi, Carl Sagan, and members of Operation Paperclip.
Reiffel also worked for NASA and the Illinois Institute of Technology, and won a Peabody Award for his work on the radio program The World Tomorrow.
His experience with broadcasting led him to invent the telestrator as a visual aid for his programming; Reiffel held over fifty different patents for his inventions.