Reginald Fessenden
Reginald Aubrey Fessenden (October 6, 1866 – July 22, 1932) was a Canadian-born inventor, who did a majority of his work in the United States and also claimed U.S. citizenship through his American-born father. During his life he received hundreds of patents in various fields, most notably ones related to radio and sonar.
Benjamin Feingold
Benjamin F. Feingold (born June 15, 1899 in Pittsburgh, Pennsylvania, USA; died, March 23, 1982) was a pediatric allergist from California, who proposed in 1973 that salicylates, artificial colors, and artificial flavors cause hyperactivity in children. Hyperactivity is now classified as Attention deficit hyperactivity disorder (ADHD).