Harold Horton Sheldon (April 13, 1893 – December 23, 1964) was a Canadian-American physicist, scientist, inventor, teacher, editor and author. He was a science editor who wrote on futuristic subjects, especially pertaining to human space travel.
Sheldon was born on April 13, 1893 and raised in Brockville, Ontario. His parents were Harvey Sheldon and Mary Christian (Laqeau) Sheldon. The Sheldons immigrated to the United States in 1917.
Sheldon attended Queen's University in Kingston, Ontario where he received his Bachelor of Arts degree in 1916 and Master of Arts degree in 1917. He received his Ph.D. in 1920 from the University of Chicago and was an assistant professor of physics there 1918 and 1919. He later attended Brooklyn Polytechnic Institute in New York City and received a degree in Electrical engineering in 1934.
Sheldon became a physics instructor at the University of Michigan in 1922. He served as science editor of The New York Herald-Tribune from 1927–1931. He was a professor at New York University from 1927 to 1941 and Dean at University of Miami from 1946 to 1953. The 1927–1928 New York University Bulletin lists Sheldon as a Professor of Physics and includes his education: A.B. 1916, A.M. 1917, Queens; PhD 1920, Chicago. The 1940–41 Bulletin lists him as "Professor of Physics and Administrative Assistant in Charge of Science Programs, Division of General Education", and includes an additional degree: E.E. 1934 Polytechnic Institute of Brooklyn. In the intervening years he also served as Administrative Chairman of the Physics Department.
Sheldon became a professor at Roosevelt University in 1956. He was eventually promoted by president Edward J. Sparling and became the chairman of the physics department. In the 1960s he was the acting dean of faculties and a vice president of the university until his death. He was science editor of The New York Herald Tribune from 1928 to 1931. For the Tribune he wrote on futuristic subjects, that ultimately became matters of scientific interest to the general public. Likewise, he was the Prentice-Hall science editor.