Physical and mathematical scientists

Kit H. Bowen

Kit H. Bowen, also known as Kit Bowen, is an American chemist at Johns Hopkins University known for negative-ion photoelectron spectroscopy of clusters, including uranium-containing anions.

Kiyoshi Itō

Kiyoshi Itō (伊藤清, 1915–2008) was a Japanese mathematician and Kyoto University professor who created Itô calculus, giving rigorous meaning to integration along random Brownian paths.

Kiyoshi Oka

Kiyoshi Oka (岡潔; 1901–1978) was a Japanese mathematician who solved major problems in complex analysis between 1936 and 1953, including the Levi problem and the coherence of the structure sheaf.

Kiyotomi Kaneda (金田清臣) is a Japanese catalytic chemist and Osaka University professor emeritus known for hydroxyapatite-supported metal catalysts for green synthesis, winning the first Green Sustainable Chemistry Award in 2001.

Klaas‐Jan Tielrooij

Klaas-Jan Tielrooij is a nanoscientist who leads the Ultrafast Dynamics in Nanoscale Systems group, founded at ICN2 in Barcelona in 2018, and became Full Professor at Eindhoven University of Technology in 2026.

Klaus Bechgaard

Klaus Bechgaard (1945–2017) was a Danish chemist and professor at the University of Copenhagen who, with Denis Jérôme, discovered the first organic superconductor in 1979.

Klaus Biemann

Klaus Biemann (1926–2016) was an Austrian-born American chemist at MIT who pioneered organic mass spectrometry, led the Viking molecular analysis experiment on Mars, and developed mass spectrometric protein sequencing that laid the groundwork for proteomics.

Klaus Clusius

Klaus Clusius (1903–1963) was a German physical chemist who invented the thermal diffusion column with Gerhard Dickel in 1938, a device for separating gases and stable isotopes.

Sep 17, 2026

Klaus Fuchs

Klaus Fuchs (Klaus Emil Julius Fuchs, 1911–1988) was a German-born theoretical physicist who passed atomic bomb secrets from Los Alamos to the Soviet Union from 1941 to 1949.

Klaus H. Hofmann

Klaus Heinrich Hofmann was a German-born American biochemist and peptide chemist who spent five decades at the University of Pittsburgh and was elected to the National Academy of Sciences in 1963.

Klaus Hasselmann

Klaus Hasselmann, born 1931 in Hamburg, is a German physicist and oceanographer who won the 2021 Nobel Prize in Physics for physical modeling of Earth's climate.

Klaus Hepp

Klaus Hepp (born 1936) is a theoretical physicist, professor at ETH Zurich from 1967 to 2002, known for a rigorous proof of the Bogoliubov-Parasiuk renormalization theorem.

Klaus Hubacek

Klaus Hubacek is an ecological economist and environmental scientist who studies how household consumption drives environmental impacts, and is a professor at the University of Groningen.

Klaus Jänich

Klaus Jänich is a German mathematician who took his doctorate at Bonn in 1964 under Friedrich Hirzebruch and proved the theorem of Atiyah, now called the Atiyah–Jänich theorem.

Klaus Keil

Klaus Keil (1934–2022) was a German-American meteoriticist who co-developed the first energy-dispersive X-ray spectrometer and directed the Institute of Meteoritics at the University of New Mexico.

Klaus Kern

Klaus Kern is a German physicist who directs the Max Planck Institute for Solid State Research in Stuttgart and won the 2008 Leibniz Prize for his work on nanostructures.

Klaus Meerholz

Klaus Meerholz is a physical chemist who has held the chair of physical chemistry at the University of Cologne since 2002, working on OLEDs and organic photovoltaics.

Klaus Mezger

Klaus Mezger, born 1958, is an isotope geochemist and geochronologist, professor of geochemistry at the University of Bern since 2009, now emeritus, known for dating planetary core formation.

Klaus Mølmer

Klaus Mølmer is a Danish theoretical physicist in quantum optics and professor at the Niels Bohr Institute in Copenhagen, known for the Mølmer–Sørensen gate for trapped ions.

Klaus Müllen

Klaus Müllen (born 1947) is a German polymer chemist known for bottom-up synthesis of nanographenes and graphene nanoribbons at the Max Planck Institute for Polymer Research.

Klaus Roth

Klaus Roth (1925–2015) was a British number theorist who won the 1958 Fields Medal, the first British winner, for his theorem on approximating algebraic numbers by rationals.

Klaus Ruedenberg

Klaus Ruedenberg, born 1920 in Germany, is a theoretical chemist at Iowa State University known for orbital localization, even-tempered basis sets, and his wave-mechanical theory of the covalent bond.

Klaus Schmidt‐Rohr

Klaus Schmidt-Rohr, also known as K. Schmidt-Rohr, is a German-born solid-state NMR spectroscopist and professor of chemistry at Brandeis University, known for Nafion fuel-cell membrane research.

Klaus von Klitzing

Klaus von Klitzing, born in 1943, is a German physicist who discovered the quantum Hall effect in 1980 and received the 1985 Nobel Prize in Physics for it.

Klaus Wagner

Klaus Wagner (1910–2000) was a German mathematician who worked in graph theory, known for his 1937 planarity theorem and his conjecture proved by Robertson and Seymour.

Knut Ångström

Knut Ångström (1857–1910) was a Swedish physicist at Uppsala University who built the standard instruments for measuring solar radiation, and whose 1900 carbon dioxide experiment set back greenhouse climate theory for decades.

Knut Lundmark

Knut Lundmark was a Swedish astronomer who pioneered extragalactic distance measurement, published the first velocity–distance diagram for spiral nebulae, and directed Lund Observatory from 1929.

Knut Urban

Knut Urban, born 1941 in Stuttgart, is a German physicist at Forschungszentrum Jülich who made aberration-corrected electron microscopy practical, winning the Wolf and Kavli prizes.

Koen Vandewal

Koen Vandewal is a Belgian physicist and full professor at Hasselt University, where he chairs the physics department and is known for quantifying voltage losses in organic solar cells.