Vocation : Education : Researcher

Jan Theodoor Gerard Overbeek (Groningen, January 30, 1911 – February 19, 2007) was a Dutch professor of physical chemistry at the Utrecht University.

Jean Abraham Chrétien Oudemans (Amsterdam, 16 December 1827 – Utrecht, 14 December 1906) was a Dutch astronomer. He was the director of the Utrecht Observatory from 1875 until 1898, when he retired.
Oudemans was born in Amsterdam, son of the poet, teacher and philologist Anthonie Oudemans Sr. and Jacoba Adriana Hammecker. He entered Leiden University when he was just 16 as a student of the noted astronomer Frederik Kaiser. He became a high school teacher in Leiden when he was just 19 (1846). The next six years he worked on his dissertation on the determination of the latitude of Leiden. Next he studied asteroids and variable stars, meanwhile hoping for an academic appointment. In 1855 he became member of the Royal Netherlands Academy of Arts and Sciences.
He married Pauline Adriana Verdam (the daughter of a well-known mathematics professor Gideon Jan Verdam ) in 1856. In the same year he was appointed a professor at Utrecht University and became the first director of its observatory. However, his interest drew him towards geography. He traveled to the Dutch East Indies as head surveyor, and worked in that capacity for 18 years, publishing his works on the triangulation of the island of Java in six books.In 1874 he organized an astronomical expedition to the island of Réunion to observe the transit of Venus but, due to bad weather, the results were disappointing.Oudemans crater on Mars was named in his honor.
A brother was the botanist Corneille Antoine Jean Abram Oudemans. One of his sons was Anthonie Cornelis Oudemans Jzn, one of the fathers of cryptozoology.

Mary Elizabeth Tidball (née Peters; October 15, 1929 – February 3, 2014) was an American physiologist. She was an advocate for women in academia and STEM and a supporter of women's colleges. Tidball was a longtime faculty member at George Washington University School of Medicine & Health Sciences (GW) where she became the institution's first woman appointed professor of physiology. Her research in the 1960s on the career outcomes of graduates from women's colleges versus those from coeducational institutions sparked discussions that continued for decades. Tidball was the first female president of the Cathedral Choral Society where she sang for almost fifty years.

Charles Coffin Sims (April 14, 1937 – October 23, 2017) was an American mathematician best known for his work in group theory. Together with Donald G. Higman he discovered the Higman–Sims group, one of the sporadic groups. The permutation group software developed by Sims also led to the proof of existence of the Lyons group (also known as the Lyons–Sims group) and the O'Nan group (also known as the O'Nan–Sims group).
Sims was born and raised in Elkhart, Indiana, and received his B.S. from the University of Michigan. He did his graduate studies at Harvard University, where he was a student of John G. Thompson and received his Ph.D. degree in 1963. In his thesis, he enumerated p-groups, giving sharp asymptotic upper and lower bounds. Sims is one of the founders of computational group theory and is the eponym of the Schreier–Sims algorithm. He was a faculty member at the Department of Mathematics at Rutgers University from 1965 to 2007. During that period he served, in particular, as Department Chair (1982–84) and Associate Provost for Computer Planning (1984–87). Sims retired from Rutgers in 2007 and moved to St. Petersburg, Florida.In 2012, he became a fellow of the American Mathematical Society.

Carl Mark Pearcy, Jr. (born August 25, 1935) is an American mathematician whose research has been concentrated on operator theory and operator algebras. He has coauthored several books, including "Introduction to Operator Theory I", Introduction to Analysis", and "Measure and integration", all published by Springer and coauthored by Arlen Brown (and Hari Bercovici in the case of Measure and integration). Pearcy had 31 Ph. D. students at Michigan and TAMU
, several of whom are outstanding mathematicians. Pearcy's bibliography contains more than 150 papers, and his research has concerned the invariant subspace problem and the theory of dual algebras.

Antonio Velasco Piña (8 September 1935 – 27 December 2020) was a Mexican novelist, spiritual writer and essayist.
He was the founder of La Nueva Mexicanidad, a group advocating the Mexicanism or Mexicanista (Mexicayotl) movement purportedly based on Aztec religion and Aztec Superiority over all other indigenous tribes.
The movement is partly inspired by the writings of French anthropologist Laurette Séjourné who specialized on Aztec and Mesoamerican spirituality.
El círculo negro (2006) presents a conspiracy theory according to which Mexico during the mid 20th century was governed by a secret society called "the black circle" or the descendants of The Aztec Triple Alliance Elite which assassinated Mexican presidents who sought reelection. Rewriting history and propagandizing Aztec Culture over all Mexicanos and American Chicanos.
Piña died from COVID-19 in 2020.

Segundo Galicia Sánchez (August 11, 1938 – December 14, 2020) was a Peruvian professor and sociologist.

Henry Farmer Dobyns, Jr. (July 3, 1925 – June 21, 2009) was an anthropologist, author and researcher specializing in the ethnohistory and demography of native peoples in the American hemisphere. He is most well known for his groundbreaking demographic research on the size of indigenous American populations before the arrival of Christopher Columbus in 1492.

Ludwig Halberstädter (9 December 1876, in Beuthen, Oberschlesien – 20 August 1949) was a German-Jewish radiologist.
In 1901 he obtained his medical doctorate from the University of Breslau, and following graduation became an assistant to surgeon Carl Garré (1857–1928) at the University of Königsberg. Afterwards he returned to Breslau as an assistant to dermatologist Albert Neisser (1855–1916), under whose direction he participated on a medical research mission to Java (1907).
In 1922 he obtained his habilitation for dermatology and radiation therapy in Berlin. Here he became director of the radiation department at the Instituts für Krebsforschung (Institute for Cancer Research), Berlin-Dahlem. In this capacity he used thorium as a treatment for cancer. In 1933 he emigrated from Nazi Germany to Palestine, where he became director of radiation therapy at the Hadassah Hospital in Jerusalem. He died in New York City on August 20, 1949.
In 1905 he introduced radiation for ablation of the ovaries.

Carlos Miguel Ramón Basombrío Iglesias (born 31 August 1957) is a Peruvian sociologist, journalist and political scientist. He served as Minister of the Interior in the Pedro Pablo Kuczynski administration from July 2016 to December 2017.