Johannes Herman Frederik Umbgrove

Johannes Herman Frederik Umbgrove ( born February 5, 1899 in Hulsberg ( Limburg), † June 14, 1954 in Wassenaar ), Jan Umbgrove known as, was a Dutch geologist and geoscientist.

Umbgrove studied geology at the University of Leiden. He completed his studies in 1926 and found work as a paleontologist with the service van de Nederlands Indië Mijnbouw in ( Geological Survey of the Dutch East Indies ), where he studied tertiary Foraminifera and corals. He also devoted himself to the study of volcanoes, tectonics, coastal morphology and bathymetry of the waters around the Sunda Islands.

In 1929 he went back to Leiden to become an assistant to his former teacher, Berend George Escher ( 1885-1967 ) there. In 1930 he was appointed professor at the Department of Stratigraphy and Paleontology at the University of Delft. His research was again multidiszipliär here. He studied the paleogeography of the Dutch East Indies, he utilized by data that FA Vening - Meinesz was collected by gravity measurements, examined the paleontology of corals and coral reefs, plant tectonic and volcanological research and dealt with the geology of the Netherlands. Due to its diversified research, he was one of the first, conceived the earth as a system variable. This idea he formulated in his book The pulse of the earth by 1942.

In 1952 he became seriously ill and was confined to the bed, where he continued to write until his death in 1954.