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.
Paul Knutson
King Magnus however was ruling Norway only as regent for his son, King Haakon, who came of age a few months later. There is no evidence that the proposed expedition ever sailed, except for the negative evidence that the 1354 order seems to be the only document mentioning Knutson after 1348. Although this indicates that Knutson survived the arrival of the Black Death ("Svartedauden") plague at Bergen in 1349, many other government officials throughout the country did not. Arne Einarsson Vade, Archbishop of Nidaros, died in 1349 during the Black Death, along with the entire diocese staff and a breakdown in record-keeping means that it is very difficult to tell what was actually happening in the years following the plague.
Some later day historians, including Hjalmar Holand, have asserted that Knutson's expedition may have journeyed deep into North America and created the Kensington Runestone.