John Fillmore Hayford

John Fillmore Hayford
BornMay 19, 1868
DiedMarch 10, 1925 (1925-03-11) (aged 56)
Alma materCornell University College of Engineering
Known forIsostasy
Children4, including Phyllis Hayford Hutchings
AwardsHonorary doctorate from George Washington University 1918; Victoria Medal of the Royal Geographical Society 1924
Scientific career
FieldsGeodesy
InstitutionsUnited States Coast and Geodetic Survey; Northwestern University, College of Engineering

John Fillmore Hayford (May 19, 1868 – March 10, 1925) was an eminent United States geodesist. His work involved the study of isostasy and the construction of a reference ellipsoid for approximating the figure of the Earth. Hayford was elected to the United States National Academy of Sciences in 1911 and the American Philosophical Society in 1915. The crater Hayford on the far side of the Moon is named after him. Mount Hayford, a 1,871 m mountain peak near Metlakatla, Alaska, United States, is named after him. A biography of Hayford may be found in the Biographical Memoirs of the National Academy of Sciences, 16 (5), 1935.