Jan Smit (born 8 April 1948) is a Dutch

paleontologist Paleontology, also spelled as palaeontology or palæontology, is the scientific study of the life of the past, mainly but not exclusively through the study of fossils. Paleontologists use fossils as a means to classify organisms, measure geolo ...

. He was affiliated with the Faculty of Earth and Life Sciences at the

Vrije Universiteit Amsterdam The (abbreviated as ''VU Amsterdam'' or simply ''VU'' when in context) is a public university, public research university in Amsterdam, Netherlands, founded in 1880. The VU Amsterdam is one of two large, publicly funded research universities in ...

from 2003 to 2013 as a professor of event

stratigraphy Stratigraphy is a branch of geology concerned with the study of rock layers (strata) and layering (stratification). It is primarily used in the study of sedimentary and layered volcanic rocks. Stratigraphy has three related subfields: lithost ...

, studying rapid changes in the geological record related to

mass extinction An extinction event (also known as a mass extinction or biotic crisis) is a widespread and rapid decrease in the biodiversity on Earth. Such an event is identified by a sharp fall in the diversity and abundance of multicellular organisms. It occ ...

Career

Smit graduated from the

University of Amsterdam The University of Amsterdam (abbreviated as UvA, ) is a public university, public research university located in Amsterdam, Netherlands. Established in 1632 by municipal authorities, it is the fourth-oldest academic institution in the Netherlan ...

in 1974 with a master's degree in geology. In 1981 he obtained his PhD (''

cum laude Latin honors are a system of Latin phrases used in some colleges and universities to indicate the level of distinction with which an academic degree has been earned. The system is primarily used in the United States. It is also used in some Sout ...

'') at the same university. Smit's main area of research is on the

Cretaceous–Paleogene extinction event The Cretaceous–Paleogene (K–Pg) extinction event, also known as the K–T extinction, was the extinction event, mass extinction of three-quarters of the plant and animal species on Earth approximately 66 million years ago. The event cau ...

, which ended the

Cretaceous period The Cretaceous ( ) is a geological period that lasted from about 143.1 to 66 million years ago (Mya). It is the third and final period of the Mesozoic Era, as well as the longest. At around 77.1 million years, it is the ninth and longest geologi ...

and killed all non-avian

dinosaur Dinosaurs are a diverse group of reptiles of the clade Dinosauria. They first appeared during the Triassic Geological period, period, between 243 and 233.23 million years ago (mya), although the exact origin and timing of the #Evolutio ...

s. He was an early researcher into the now-accepted belief that an

asteroid impact An impact event is a collision between astronomical objects causing measurable effects. Impact events have been found to regularly occur in planetary systems, though the most frequent involve asteroids, comets or meteoroids and have minimal effe ...

was responsible for their extinction; his dissertation, titled "A Catastrophic Event at the Cretaceous–Tertiary Boundary", was related to

Luis Luis is a given name. It is the Spanish form of the originally Germanic name or . Other Iberian Romance languages have comparable forms: (with an accent mark on the i) in Portuguese and Galician, in Aragonese and Catalan, while is archai ...

and

Walter Alvarez Walter Alvarez (born October 3, 1940) is a professor in the Earth and Planetary Science department at the University of California, Berkeley. He and his father, Nobel Prize–winning physicist Luis Alvarez, developed the theory that dinosaurs w ...

's recently published theory on the extinction event. The explanation is known as the

Alvarez hypothesis The Alvarez hypothesis posits that the Extinction event, mass extinction of the non-avian dinosaurs and many other living things during the Cretaceous–Paleogene extinction event was caused by the Impact event, impact of a large asteroid on the Ea ...

, but was proposed independently by Smit, despite his later publication. Luis Alvarez described Smit as "a KT retaceous–Tertiaryexpert hohas studied more KT sites around the world than anyone else". In 2019 ''

The New Yorker ''The New Yorker'' is an American magazine featuring journalism, commentary, criticism, essays, fiction, satire, cartoons, and poetry. It was founded on February 21, 1925, by Harold Ross and his wife Jane Grant, a reporter for ''The New York T ...

'' labelled Smit as a "world authority" on the impact and extinction event.

Personal life

Smit's daughter is Renske Smit, a researcher at the Astrophysics Research Institute at

Liverpool John Moores University Liverpool John Moores University (abbreviated LJMU) is a public university, public research university in the city of Liverpool, England. The university can trace its origins to the Liverpool Mechanics' School of Arts, established in 1823. This ...

Liverpool Liverpool is a port City status in the United Kingdom, city and metropolitan borough in Merseyside, England. It is situated on the eastern side of the River Mersey, Mersey Estuary, near the Irish Sea, north-west of London. With a population ...

, England. She is one of only a handful of UK-based astronomers in the core survey teams of the

James Webb Space Telescope The James Webb Space Telescope (JWST) is a space telescope designed to conduct infrared astronomy. As the largest telescope in space, it is equipped with high-resolution and high-sensitivity instruments, allowing it to view objects too old, Lis ...

. Smit's son-in-law is Robert Crain, a professor of theoretical astrophysics at the same university.

Awards

In 2016, he was awarded the Van Waterschoot van der Gracht Medal. A main-belt asteroid, 19140 Jansmit, is named after Smit.

References

{{DEFAULTSORT:Smit, Jan 1948 births Dutch paleontologists University of Amsterdam alumni Living people Barringer Medal winners