Chappelle (October 24, 1925 – October 14, 2019) was an African-American scientist who made valuable contributions in the fields of medicine, philanthropy, food science, and Astrochemistry.
His achievements led to his induction into the National Inventors Hall of Fame for his work on Bio-luminescence, in 2007.
Being honored as one of the 100 most distinguished African American scientists of the 20th Century, he was also a member of the American Chemical Society, the American Society of Biochemistry and Molecular Biology, the American Society of Photobiology, the American Society of Microbiology, and the American Society of Black Chemists.