Hal Helgeson

{{Short description|American geochemist (1932–2007)}}

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| name = Hal Helgeson

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| birth_name = Harold C. Helgeson

| birth_date = {{birth date |1931|11|13}}

| birth_place = Minneapolis, Minnesota, U.S.

| death_date = {{death date and age |2007|05|28 |1931|11|13}}

| death_place = Berkeley, California, U.S.

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| fields = Geochemistry

| workplaces = Northwestern University
University of California, Berkeley

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| education = Michigan State University (BS)
Harvard University (PhD)

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| doctoral_advisor = Robert M. Garrels

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| doctoral_students = Everett Shock

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| awards = Urey Medal
V. M. Goldschmidt Award

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|branch_label= Branch

|serviceyears= 1954–1956

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|unit=497th Reconnaissance Technical Squadron

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Harold C. Helgeson (November 13, 1931 – May 28, 2007) was an American scientist and educator. A pioneering theoretical geochemist, he was a professor at the University of California, Berkeley.{{cite news|author=Sanders, Robert|title=Geochemist Harold Helgeson has died at 75|date=11 June 2007|newspaper=UC Berkeley News|url=http://www.berkeley.edu/news/media/releases/2007/06/11_helgeson.shtml}}