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.
Nils Carl Gustaf Fersen Gyldenstolpe
Nils Carl Gustaf Fersen Gyldenstolpe (30 September 1886 – 10 April 1961) was a Swedish explorer, zoologist, and ornithologist. Born in the central Swedish province of Jämtland, he visited Lapland from 1906 to 1909 and joined the expedition of Dr. Paul Rosenius to southern Algeria. He also visited Thailand in 1911–12 and the Malay Peninsula in 1914–15. He studied at Uppsala University and joined under Professor 
Einar Lönnberg at the Department of Vertebrates of the Naturhistoriska Riksmuseum in Stockholm. He continued to work here throughout his life. In 1924 he obtained a Ph.D. from Lund University for his studies on the birds of central and eastern Africa.