Dénes Kőnig (September 21, 1884 – October 19, 1944) was a Hungarian mathematician of Jewish heritage who worked in and wrote the first textbook on the field of graph theory. Biography Kőnig was born in Budapest, the son of mathematician Gyula Kőnig. In 1907, he received his doctorate at, and joined the faculty of the Royal Joseph University in Budapest (today Budapest University of Technology and Economics). His classes were visited by Paul Erdős, who, as a first year student, solved one of his problems. Kőnig became a full professor there in 1935. To honor his fathers' death in 1913, Kőnig and his brother György created the Gyula Kőnig prize in 1918. This prize was meant to be an endowment for young mathematicians, however was later devaluated. But the prize remained as a medal of high scientific recognition. In 1899, he published his first work while still attending High School in a journal Matematikai és Fizikai Lapok. After his graduation in 1902, he won first place in a mathematical competition "Eötvös Loránd". Shortly after he wrote the first of two book collections Matematikai Mulatságok (Mathematical Entertainments). He spent four semesters at the university in Budapest and his last five in Göttingen, during which he studied under the famous mathematicians József Kürschák and Hermann Minkowski. He then received his doctorate in 1907 due to his dissertation in geometry, that same year he began working for the Technische Hochschule in Budapest and remained a part of the faculty till his death in 1944. At first he started as an assistant in problem sessions, in 1910 he was promoted to "oberassistant", and then promoted to "Privatdocent" in 1911 teaching nomography, analysis situs (later to be known as topology), set theory, real numbers and functions, and graph theory (the name "graph theory" didn't appear in the university catalogue until 1927). During this time he would be a guest speaker giving mathematics lecture for architecture and chemistry students, in 1920 these lectures made their way into book form. at the Technische Hochschule. From 1915 to 1942 he was on a committee to judge school contests in mathematics, collecting problems for these contests, and organizing them. Then in 1933 he was elected as secretary of the society and in 1942 he became the chairman of this committee. He then decided to make edits in the society's journal during his time on the committee till his death.