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.
Frank Freidel
Freidel's magnum opus was his 5-volume biography of Franklin Delano Roosevelt: "The Apprenticeship" (1952), "The Ordeal" (1954), "The Triumph" (1956), "F.D.R. and the South" (1965), and "Launching the New Deal" (1973). After publishing a one-volume condensed biography "Franklin D. Roosevelt: A Rendezvous with Destiny" in 1990, Freidel died in Cambridge, Massachusetts in 1993 of pneumonia and cancer while living in Belmont, Massachusetts, leaving the sixth volume unfinished.