Johannes Herman Frederik Umbgrove, called in short January Umbgrove, was a Dutch geologist and Earth scientist
Education
Umbgrove studied geology at Leiden University, he finished his studies in 1926. He then became employed as a paleontologist for the Dienst van de Mijnbouw in Nederlands Indië (Geological Survey of the Dutch East Indies), where he studied Tertiary foraminifera and corals. He also studied volcanoes, tectonics, coastal morphology and the bathymetry of the seas surrounding the Sunda Islands.
Career
In 1930 he became professor in stratigraphy and paleontology at Delft University. His research was again multidiciplinary. He studied the paleogeography of the Dutch East Indies from the data acquired by the gravitational surveys of Field Artillery Vening Meinesz, the paleontology of corals and coral reefs, tectonics, the geology of the Netherlands and volcanology.
Because of his broad field of interest he was one of the first to think of the Earth as one dynamic system, an idea on which he wrote his book the Pulse of the Earth in 1942.
Another book on paleontology was published in 1943. When he turned seriously ill in 1952 he kept writing in his bed, until his death in 1954.