Vocation : Writers : Textbook/ Non-fiction

Jean-Charles Houzeau de Lehaie (October 7, 1820 – July 12, 1888) was a Belgian astronomer and journalist. A French speaker, he moved to New Orleans after getting in trouble for his politics in Belgium.
In the U.S. he continued his journalistic, astronomical, and political pursuits. He was an abolitionist and joined with unionists in Texas before the American Civil War. In New Orleans he worked with Dr. Louis Charles Roudanez at the newspapers he founded in the 1860s.
Houzeau migrated to Jamaica in the postwar years. After reinstatement from an observatory in Brussels, he returned to Europe to work. He came back to Texas for an astronomical event. He published stirring memoirs and other accounts of his adventures and contacts during his travels, as well as several works on astronomical subjects.

Théophile Ernest de Donder (French: [də dɔ̃dɛʁ]; 19 August 1872 – 11 May 1957) was a Belgian mathematician, physicist and chemist famous for his work (published in 1923) in developing correlations between the Newtonian concept of chemical affinity and the Gibbsian concept of free energy.

Hans-Otto Meissner (4 June 1909 – 8 September 1992) was a German lawyer and Nazi diplomat, posted in London, Tokyo, Moscow, and Milan, among other cities. He is best known as a writer and novelist publishing a series of books, which proved successful.

Giulio Einaudi (Italian pronunciation: [ˈdʒuːljo eiˈnaudi]; 2 January 1912 – 5 April 1999) was an Italian book publisher. The eponymous company that he founded in 1933 became "a European wellspring of fine literature, intellectual thought and political theory" and was once considered the most prestigious publishing house in Italy. He was also the author of books on literature, history, philosophy, art and science.

Francesco de Sanctis (28 March 1817 – 29 December 1883) was a leading Italian literary critic and scholar of Italian language and literature during the 19th century.

Donald Delbert Clayton (March 18, 1935 – January 3, 2024) was an American astrophysicist whose most visible achievement was the prediction from nucleosynthesis theory that supernovae are intensely radioactive. That earned Clayton the NASA Exceptional Scientific Achievement Medal (1992) for “theoretical astrophysics related to the formation of (chemical) elements in the explosions of stars and to the observable products of these explosions”. Supernovae thereafter became the most important stellar events in astronomy owing to their profoundly radioactive nature. Not only did Clayton discover radioactive nucleosynthesis during explosive silicon burning in stars but he also predicted a new type of astronomy based on it, namely the associated gamma-ray line radiation emitted by matter ejected from supernovae. That paper was selected as one of the fifty most influential papers in astronomy during the twentieth century for the Centennial Volume of the American Astronomical Society. He gathered support from influential astronomers and physicists for a new NASA budget item for a gamma-ray-observatory satellite, achieving successful funding for Compton Gamma Ray Observatory. With his focus on radioactive supernova gas Clayton discovered a new chemical pathway causing carbon dust to condense there by a process that is activated by the radioactivity.Clayton also authored a novel, The Joshua Factor (1985), a parable of the origin of mankind utilizing the mystery of solar neutrinos; a science autobiography and a memoir; and a history of the origin of each isotope, Handbook of Isotopes in the Cosmos (Cambridge Univ. Press, 2003).
Clayton died on January 3, 2024, at the age of 88.

Jean Mill (née Sones; May 14, 1926 – June 6, 2018) was an American cat breeder. Mill is best known as the founder of the Bengal cat breed: Mill successfully crossed the wild Asian leopard cat with a domestic cat, and then backcrossed the offspring through five generations to create the domestic Bengal. Mill made contributions to two other cat breeds: the Himalayan and the standardized version of the Egyptian Mau. Mill and her first husband, Robert Sugden, were involved in a precedent-setting case about the United States government's power to monitor short wave radio communications. She also authored two books on Bengal cats.

Alan Edward Nourse (; August 11, 1928 – July 19, 1992) was an American science fiction writer and physician. He wrote both juvenile and adult science fiction, as well as nonfiction works about medicine and science. His SF works sometimes focused on medicine and/or psionics.
His most notable pen name was Doctor X. He used this pseudonym when writing for a medical column in a science fiction magazine, allowing him to combine his expertise in medicine with his passion for science fiction.