Robert Phillip Sharp (24 June 1911 – 25 May 2004) was an American

geomorphologist Geomorphology () is the scientific study of the origin and evolution of topographic and bathymetric features generated by physical, chemical or biological processes operating at or near Earth's surface. Geomorphologists seek to understand why ...

and expert on the geological surfaces of the

Earth Earth is the third planet from the Sun and the only astronomical object known to Planetary habitability, harbor life. This is enabled by Earth being an ocean world, the only one in the Solar System sustaining liquid surface water. Almost all ...

and the planet

Mars Mars is the fourth planet from the Sun. It is also known as the "Red Planet", because of its orange-red appearance. Mars is a desert-like rocky planet with a tenuous carbon dioxide () atmosphere. At the average surface level the atmosph ...

. Sharp served as the chairman of the Division of Geological Sciences at

California Institute of Technology The California Institute of Technology (branded as Caltech) is a private research university in Pasadena, California, United States. The university is responsible for many modern scientific advancements and is among a small group of institutes ...

(Caltech) from 1952 to 1968. He built the modern department and especially recruited new faculty in

geochemistry Geochemistry is the science that uses the tools and principles of chemistry to explain the mechanisms behind major geological systems such as the Earth's crust and its oceans. The realm of geochemistry extends beyond the Earth, encompassing the e ...

, tectonic geomorphology,

planetary science Planetary science (or more rarely, planetology) is the scientific study of planets (including Earth), celestial bodies (such as moons, asteroids, comets) and planetary systems (in particular those of the Solar System) and the processes of ...

, and field geology.

Biography

Sharp specialized in

geomorphology Geomorphology () is the scientific study of the origin and evolution of topographic and bathymetric features generated by physical, chemical or biological processes operating at or near Earth's surface. Geomorphologists seek to understand wh ...

and published heavily in glacial terrain (the

Sierra Nevada The Sierra Nevada ( ) is a mountain range in the Western United States, between the Central Valley of California and the Great Basin. The vast majority of the range lies in the state of California, although the Carson Range spur lies primari ...

, Blue Glacier in the

Olympic Peninsula The Olympic Peninsula is a large peninsula in Western Washington that lies across Puget Sound from Seattle, and contains Olympic National Park. It is bounded on the west by the Pacific Ocean, the north by the Strait of Juan de Fuca, and the ...

, and

Alaska Alaska ( ) is a non-contiguous U.S. state on the northwest extremity of North America. Part of the Western United States region, it is one of the two non-contiguous U.S. states, alongside Hawaii. Alaska is also considered to be the north ...

Mojave Desert The Mojave Desert (; ; ) is a desert in the rain shadow of the southern Sierra Nevada mountains and Transverse Ranges in the Southwestern United States. Named for the Indigenous peoples of the Americas, indigenous Mohave people, it is located pr ...

terrain, and the

Ruby Ruby is a pinkish-red-to-blood-red-colored gemstone, a variety of the mineral corundum ( aluminium oxide). Ruby is one of the most popular traditional jewelry gems and is very durable. Other varieties of gem-quality corundum are called sapph ...

-East Humboldt Range in north-central

Nevada Nevada ( ; ) is a landlocked state in the Western United States. It borders Oregon to the northwest, Idaho to the northeast, California to the west, Arizona to the southeast, and Utah to the east. Nevada is the seventh-most extensive, th ...

. Sharp retired in 1979 but continued leading geological field trips afterwards (with emphasis on the

Grand Canyon The Grand Canyon is a steep-sided canyon carved by the Colorado River in Arizona, United States. The Grand Canyon is long, up to wide and attains a depth of over a mile (). The canyon and adjacent rim are contained within Grand Canyon Nati ...

geology using rubber rafts).

Biography and education

Sharp was a native son of

Oxnard, California Oxnard () is a city in Ventura County in the U.S. state of California, United States. On California's Central Coast (California), Central Coast, it is the most populous city in Ventura County and the List of largest California cities by populati ...

. He attended Caltech as an undergraduate, beginning in 1930, earning a bachelor's degree (1934) in geology, and master's degree (1935) in geology. While at Caltech, he was quarterback on the football team. He received a doctorate at

Harvard University Harvard University is a Private university, private Ivy League research university in Cambridge, Massachusetts, United States. Founded in 1636 and named for its first benefactor, the History of the Puritans in North America, Puritan clergyma ...

(1938) in geology under Professor Kirk Bryan.

Career

Sharp served in the

United States Army The United States Army (USA) is the primary Land warfare, land service branch of the United States Department of Defense. It is designated as the Army of the United States in the United States Constitution.Article II, section 2, clause 1 of th ...

during World War II as an analyst in the Arctic, Desert and Tropical Information Center and achieved the rank of captain. During World War II, Sharp performed extensive field work in the

Aleutian Islands The Aleutian Islands ( ; ; , "land of the Aleuts"; possibly from the Chukchi language, Chukchi ''aliat'', or "island")—also called the Aleut Islands, Aleutic Islands, or, before Alaska Purchase, 1867, the Catherine Archipelago—are a chain ...

of the Alaskan Peninsula, simultaneously testing new arctic clothing for

soldier A soldier is a person who is a member of an army. A soldier can be a Conscription, conscripted or volunteer Enlisted rank, enlisted person, a non-commissioned officer, a warrant officer, or an Officer (armed forces), officer. Etymology The wo ...

s, and quietly performing

geological mapping A geological map or geologic map is a special-purpose map made to show various geological features. Rock units or geologic strata are shown by color or symbols. Bedding planes and structural features such as faults, folds, are shown with s ...

of several islands, which he published in the '' Bulletin of the Geological Society of America''. Sharp was briefly an instructor in geology at the

University of Illinois at Urbana–Champaign The University of Illinois Urbana-Champaign (UIUC, U of I, Illinois, or University of Illinois) is a public land-grant research university in the Champaign–Urbana metropolitan area, Illinois, United States. Established in 1867, it is the f ...

before World War II, and briefly an Assistant Professor of Geology at the

University of Minnesota The University of Minnesota Twin Cities (historically known as University of Minnesota) is a public university, public Land-grant university, land-grant research university in the Minneapolis–Saint Paul, Twin Cities of Minneapolis and Saint ...

immediately after the war. As soon as possible, Caltech's Division Chairman Ian Campbell arranged for Sharp to return home to Caltech as a full professor in 1947. Sharp remained at Caltech for the next half-century, and was quickly promoted to the Chairman of the Division of Geological Sciences, later renamed to the Division of Geological and Planetary Sciences. At Caltech, Sharp mentored dozens of doctoral students in field

; these are now working at the United States Geological Survey facility in

Menlo Park, California Menlo Park ( ) is a city at the eastern edge of San Mateo County, California, San Mateo County in the San Francisco Bay Area of California, United States. It is bordered by San Francisco Bay on the north and east; East Palo Alto, California, Eas ...

and in leading geology departments throughout

North America North America is a continent in the Northern Hemisphere, Northern and Western Hemisphere, Western hemispheres. North America is bordered to the north by the Arctic Ocean, to the east by the Atlantic Ocean, to the southeast by South Ameri ...

Research

Sharp became a published expert on the glacial geomorphology of the Sierra Nevada range, the Trinity Alps of northwestern California, the

of Washington, and

Mount Saint Elias Mount Saint Elias (Was'eitushaa also designated Boundary Peak 186), the second-highest mountain in both Canada and the United States, stands on the Yukon and Alaska border about southwest of Mount Logan, the highest mountain in Canada. The Cana ...

in the Fairweather Range of Alaska. In the winter season, he focused his geological field work in the Mojave Desert of California, with emphasis on the geomorphology of Cima Dome, and the sliding stones on the

Racetrack Playa The Racetrack Playa, or The Racetrack, is a scenic dry lake feature with " sailing stones" that inscribe linear "racetrack" imprints. It is located above the northwestern side of Death Valley, in Death Valley National Park, Inyo County, Californi ...

in northern

Death Valley Death Valley is a desert valley in Eastern California, in the northern Mojave Desert, bordering the Great Basin Desert. It is thought to be the Highest temperature recorded on Earth, hottest place on Earth during summer. Death Valley's Badwat ...

. He was an expert on the physics of blown sand and the formation of sand dunes in the Mojave Desert and the

Coachella Valley The Coachella Valley ( ) is an arid rift valley in the Colorado Desert of Southern California in Riverside County. The valley has been referred to as Greater Palm Springs and occasionally the Palm Springs Area due to the historic promine ...

. He was awarded the Kirk Bryan Award by the

Geological Society of America The Geological Society of America (GSA) is a nonprofit organization dedicated to the advancement of the geosciences. History The society was founded in Ithaca, New York, in 1888 by Alexander Winchell, John J. Stevenson, Charles H. Hi ...

for his work on the geomorphology of sand dunes in desert terrain. Sharp loved weekend field trips, and so he authored a number of field books in geology of

southern California Southern California (commonly shortened to SoCal) is a geographic and Cultural area, cultural List of regions of California, region that generally comprises the southern portion of the U.S. state of California. Its densely populated coastal reg ...

, published by Mountain Press. While in his sixties, Sharp continued to teach field geology to Caltech geology students during summer classes at Henry Mountain in

Utah Utah is a landlocked state in the Mountain states, Mountain West subregion of the Western United States. It is one of the Four Corners states, sharing a border with Arizona, Colorado, and New Mexico. It also borders Wyoming to the northea ...

, where

Grove Karl Gilbert Grove Karl Gilbert (May 6, 1843 – May 1, 1918), known by the abbreviated name G. K. Gilbert in academic literature, was an American geologist. Biography Gilbert was born in Rochester, New York, and graduated from the University of Rochester. ...

discovered

laccolith A laccolith is a body of intrusive rock with a dome-shaped upper surface and a level base, fed by a conduit from below. A laccolith forms when magma (molten rock) rising through the Earth's crust begins to spread out horizontally, prying apart ...

s. After retiring from Caltech, Sharp and his wife Jean moved their home from Altadena to Santa Barbara. They had two children.

Awards and honors

* Robert Sharp was a member of the United States

National Academy of Sciences The National Academy of Sciences (NAS) is a United States nonprofit, NGO, non-governmental organization. NAS is part of the National Academies of Sciences, Engineering, and Medicine, along with the National Academy of Engineering (NAE) and the ...

and received the

National Medal of Science The National Medal of Science is an honor bestowed by the President of the United States to individuals in science and engineering who have made important contributions to the advancement of knowledge in the fields of behavioral science, behavior ...

in 1989. *He won the Penrose Medal from the

, its highest honor. *Sharp was honored by Caltech as the first named professorship in geology: the Robert Phillip Sharp Chair in Geology. *The Hungaria asteroid

5426 Sharp 5426 Sharp, provisional designation , is a bright Hungaria asteroid and suspected Binary asteroid, binary system from the inner regions of the asteroid belt, approximately 2–3 kilometers in diameter. It was discovered on 16 February 1985, by A ...

, discovered by

Carolyn Shoemaker Carolyn Jean Spellmann Shoemaker (June 24, 1929 – August 13, 2021) was an American astronomer and a co-discoverer of Comet Shoemaker–Levy 9, Comet Shoemaker–Levy 9. She discovered 32 comets (then a record for the most by an individu ...

Palomar Observatory The Palomar Observatory is an astronomical research observatory in the Palomar Mountains of San Diego County, California, United States. It is owned and operated by the California Institute of Technology (Caltech). Research time at the observat ...

in 1985, was named in his honor. Naming citation was published on 17 March 1995 (). * On March 28, 2012,

NASA The National Aeronautics and Space Administration (NASA ) is an independent agencies of the United States government, independent agency of the federal government of the United States, US federal government responsible for the United States ...

named a mountain "Mount Sharp" on the planet

, in his honor. The mountain is located at the center of

Gale crater Gale is a crater, and probable dry lake, at in the northwestern part of the Aeolis quadrangle on Mars. It is in diameter and estimated to be about 3.5–3.8 billion years old. The crater was named after Walter Frederick Gale, an amateur a ...

, where in August of the same year the Mars rover ''

Curiosity Curiosity (from Latin , from "careful, diligent, curious", akin to "care") is a quality related to inquisitive thinking, such as exploration, investigation, and learning, evident in humans and other animals. Curiosity helps Developmental psyc ...

'' successfully landed. However, on May 16, 2012, Mount Sharp had officially been renamed "

Aeolis Mons Mount Sharp, officially Aeolis Mons (), is a mountain on Mars. It forms the central peak within Gale crater and is located around , rising high from the valley floor. Its ID in the United States Geological Survey's Gazetteer of Planetary Nomenc ...

" by the

International Astronomical Union The International Astronomical Union (IAU; , UAI) is an international non-governmental organization (INGO) with the objective of advancing astronomy in all aspects, including promoting astronomical research, outreach, education, and developmen ...

, while a neighboring crater was instead named after the scientist.

References

External links

Robert P. Sharp - Biography/California Institute of Technology

Clarence R. Allen, "Robert Phillip Sharp", Biographical Memoirs of the National Academy of Sciences (2010)

Robert P. Sharp - Oral History/Caltech
{{DEFAULTSORT:Sharp, Robert P. 1911 births 2004 deaths 20th-century American geologists American planetary scientists California Institute of Technology people People from Oxnard, California Scientists from Pasadena, California National Medal of Science laureates Harvard University alumni Penrose Medal winners Members of the United States National Academy of Sciences