Escher created a woodcut ex libris for his brother 'Beer' with a stylized image of a volcano around 1922 (Bool number 91).

He studied geology at the Eidgenössische Technische Hochschule (Technical University) of Zürich, where he was a pupil of Albert Heim.

Escher became professor at Leiden University in 1922, at the same time he became director of the geological museum there, he was the successor of K. Martin in that position.

H. Kuenen and J. H. F. Umbgrove on zones of negative gravitational anomalies, which they explained by assuming that convection took place in the mantle.

[1] During the German occupation of the Netherlands in World War II, Escher was kept captive by the Nazis for some time.