
author
1869–1947
A Scottish physician turned geologist, he became one of the key figures in British geology in the early 20th century. His work ranged from volcanic eruptions and igneous rocks to leading the Geological Survey of Great Britain.

by Marion I. (Marion Isabel) Newbigin, Sir J. S. (John Smith) Flett
Born in Kirkwall, Orkney, in 1869, Sir John Smith Flett first trained in medicine before building his career in geology. He studied at the University of Edinburgh and became especially known for his work in petrology, the study of rocks, and for careful field investigations.
Flett joined the Geological Survey and earned a strong reputation through research on Scottish geology and volcanic regions, including studies connected with the eruptions of Soufrière in St. Vincent and Mount Pelée in Martinique. In 1920 he became Director of the Geological Survey of Great Britain and the Museum of Practical Geology, a role that placed him at the center of British geological work.
He was elected a Fellow of the Royal Society and later received major honors including a knighthood and the Wollaston Medal. Remembered as both a scientist and an able organizer, he helped shape geological research in Britain during a period of major growth.