Article · Wikipedia archive · Last revised Jun 14, 2026

John Tilton Hack

John Tilton Hack (1913–1991) was an American geologist and geomorphologist known for his contributions to establish the dynamic equilibrium concept in landscapes. Hack's law, concerning the empirical relationship between the length of streams and the area of their basins, is named after him.

Last revised
Jun 14, 2026
Read time
≈ 1 min
Length
135 w
Citations
2
Source
John Tilton Hack
Born1913 (1913)
Died1991 (aged 77–78)
Alma materHarvard University
Known forHack's law; dynamic equilibrium in landscapes
Scientific career
FieldsGeology; Geomorphology
InstitutionsUnited States Geological Survey
Kirk Bryan

John Tilton Hack (1913–1991) was an American geologist and geomorphologist known for his contributions to establish the dynamic equilibrium concept in landscapes. Hack's law, concerning the empirical relationship between the length of streams and the area of their basins, is named after him.

Hack was a student of Kirk Bryan. Hack graduated from Harvard University, where he received his bachelor's and master's degrees and doctorate in geomorphology.1 He retired from the United States Geological Survey in 1981.2

References

References

  1. "GEOLOGIST JOHN T. HACK DIES AT 78". The Washington Post. Archived from the original on 2018-01-05.
  2. Osterkamp, W.R.; Hupp, C.R. "Memorial to John T. Hack" (PDF). Memorials (FTP). pp. 59–61. (To view documents see Help:FTP)