Background
Hem, John David was born on May 14, 1916 in Starkweather, North Dakota, United States. Son of Hans Neilius and Josephine Augusta (Larsen) Hem.
Hem, John David was born on May 14, 1916 in Starkweather, North Dakota, United States. Son of Hans Neilius and Josephine Augusta (Larsen) Hem.
Student, Minot State College, 1932-1936; student, North Dakota State University, 1937-1938; student, Iowa State University, 1938; Bachelor of Science, George Washington University, 1940.
Analytical chemist, United States Geological Survey, Safford, Arizona, 1940-1942, 43-45; analytical chemist, United States Geological Survey, Roswell, New Mexico, 1942-1943; district chemist, United States Geological Survey, Albuquerque, 1945-1953; research chemist, United States Geological Survey, Denver, 1953-1963; research chemist, United States Geological Survey, Menlo Park, California, 1963-1994. Research advisor United States Geological Survey, 1974-1979, member water research advising committee,1984-1994.
Member American Chemical Society, American Geophysical Union, American Water Works Association, Geochem. Society, Society Geochemistry and Health.
Married Ruth Evans, March 11, 1945. Children: John David Junior, Michael Edward.