Academic staff of the University of Bonn

Walther Kruse (September 8, 1864 – 1943) was a German bacteriologist who was a native of Berlin.
In 1888 he received his doctorate from Berlin, where he was a student of Rudolf Virchow (1821–1902). From 1889 until 1892 he worked as a bacteriologist in Naples, and in 1892 travelled to Egypt to perform research on dysentery. In 1893 he became an assistant to hygienist Carl Flügge (1847–1923) in Breslau, and in 1898 became an associate professor at the University of Bonn. Later he served as a full professor in Königsberg (1900), Bonn (1911) and Leipzig (1913).
Walther Kruse is remembered for his work in parasitology and his research of intestinal bacteria infections. He performed extensive studies of Shigella dysenteriae during an epidemic of dysentery in the Ruhr area of Germany. This organism is sometimes referred to as the "Shiga–Kruse bacillus", and its associated disease as "Shiga–Kruse dysentery". These eponyms are shared with Japanese bacteriologist Kiyoshi Shiga (1871–1957). Kruse documented his findings in a 1900 treatise titled Über die Ruhr als Volkskrankheit und ihren Erreger.
In 1914 he demonstrated that the common cold could be transmitted to healthy individuals via nasal secretions that were free of bacteria. The results of these experiments were published in a treatise called Die Erreger von Husten und Schnupfen (1914). A specialized tool used to spread material over the surface of a culture medium is called "Kruse's brush".

Hans Meerwein (May 20, 1879 in Hamburg, Germany – October 24, 1965 in Marburg, Germany) was a German chemist.
Several reactions and reagents bear his name, most notably the Meerwein–Ponndorf–Verley reduction, the Wagner–Meerwein rearrangement, the Meerwein arylation reaction, and Meerwein's salt.

Reinhard Mecke (born 14 July 1895 in Stettin; died 30 December 1969) was a German physicist, who focused on chemical physics. He was one of the pioneers of infrared spectroscopy.
Reinhard Mecke studied from 1913 mathematics and physics at the universities of Freiburg, Bern and Marburg and did his doctorate at Franz Richarz in Marburg in 1920 on halos in homogeneous nebulas. He then worked for Heinrich Konen at the university of Bonn, where he habilitated in 1923 on spectral bands of jod and where he became a privatdozent. 1927 he married one of his PhD students M. Guillery and had with her nine children including Dieter Mecke.
1932 he became extraordinary professor for chemical physics at the University of Heidelberg, as proposed by Max Trautz. He investigated spectral bands of evaporated water and infrared and Raman spectroscopy of small organic molecules. He proved the existence of the spin onto rotary oscillation spectra of molecules. 1937 he became professor for theoretical physics at the university of Freiburg and investigated there hydrogen bonds by infrared spectroscopy. 1942 he became ordinary professor and director of the Institute for Physical Chemistry. Additionally, he was in 1958 the founder and until 1968 the director of the Institute for electric materials (Institut für Elektrowerkstoffe) of the Fraunhofer-Gesellschaft and the head of the Institute for Physical Chemistry. 1963 he retired in Freiburg.
1964 he became member of the Leopoldina. 1965 he received the Bunsen medal.
He was co-author of the Handbuch der Physik by Geiger and Scheel. His article Vorlesungstechnik with Anton Lambertz of the first volume was also published as a book. He was one of the organisers of the Conferences of nobel laureates in Lindau.

Karl Koester (born 2 April 1843 in Bad Dürkheim, died 2 December 1904 in Bonn) was a German pathologist and rector of the University of Bonn from 1898 to 1899. He was professor of pathology and director of the Institute of Pathology at the University of Bonn from 1874 to 1904. He held the title Geheimer Medizinalrat.
Koester studied medicine in Munich, Tübingen and Würzburg, and obtained his doctoral degree in Würzburg in 1867. His doctoral advisor and mentor was Friedrich Daniel von Recklinghausen, and he subsequently worked as Recklinghausen's assistant. From 1873 to 1874 he was professor of general medical pathology and anatomical pathology at the University of Giessen. He succeeded Eduard von Rindfleisch as professor of pathology at the University of Bonn in 1874.
In 1868 he published Ueber die feinere Structur der menschlichen Nabelschnur ("On the finer structure of the human umbilical cord").He became a member of the German National Academy of Sciences Leopoldina in 1880.

Andreas Franz Wilhelm Schimper (12 May 1856 – 9 September 1901) was a German botanist and phytogeographer who made major contributions in the fields of histology, ecology and plant geography. He travelled to South East Asia and the Caribbean as part of the 1899 deep-sea expedition. He coined the terms tropical rainforest and sclerophyll and is commemorated in numerous specific names.

Walther Gerlach (1 August 1889 – 10 August 1979) was a German physicist who co-discovered, through laboratory experiment, spin quantization in a magnetic field, the Stern–Gerlach effect. The experiment was conceived by Otto Stern in 1921 and successfully conducted first by Gerlach in early 1922.

Paul Pfeiffer (21 April 1875 – 4 March 1951) was an influential German chemist. He received his Ph.D. at the University of Zurich, studying under Alfred Werner, the "father of coordination chemistry". His thesis, submitted in 1898, dealt with adducts of tin halides.
Pfeiffer was considered Werner's most successful student and became Werner's assistant until, due to a dispute with his mentor, he left first for Rostock, then Karlsruhe, and finally Bonn. At Bonn, where he had studied as an undergraduate, he occupied Kekulé's chair.
Pfeiffer's work spanned many themes. The Pfeiffer effect, which involves interactions between chiral solutes, is named after his discoveries. His group first made the salen ligands, which gave the first artificial oxygen carriers. He recognized that crystals, e.g. of zinc sulfide, are large molecules.

Max Schede (7 January 1844 – 31 December 1902) was a German surgeon born in Arnsberg.
Schede studied medicine at the Universities of Halle, Heidelberg and Zurich, obtaining his medical doctorate in 1866. After serving as a doctor in the Austro-Prussian War, he became an assistant to Richard von Volkmann (1830-1889) at Halle. During the Franco-Prussian War, he was in charge of a Feldlazaretts. In 1875, he appointed head of the surgical department at Friedrichshain Hospital in Berlin, and from onward 1880, he practiced surgery at St. Georg Hospital in Hamburg.
At Hamburg he was a catalyst towards the construction of Eppendorf Hospital, becoming head of its surgical department in 1888. In 1895 he was chosen professor of surgery at the University of Bonn. Schede was a pioneer of antisepsis in Germany.
In 1890 he introduced a surgical procedure called thoracoplasty, an operation involving resection of the thorax for treatment of chronic empyema. His name is associated with the "Schede method", also known as "Schede's clot", a procedure that involves scraping off dead tissue in bone necrosis, allowing the cavity to fill with blood, then covering it with gauze and rubber.In 1874 he was a co-founder of the journal "Zentralblatt für Chirurgie".

Hermann Flohn (19 February 1912 – 23 June 1997) was a climatologist. Flohn was professor at the University of Bonn and head of the department at the Institute of Meteorology of Bonn University. He produced about 360 publications. Flohn was member in numerous scientific societies such as the Bavarian Academy, the Academy of Sciences Leopoldina, the New York Academy of Sciences, and the Royal Academy of Belgium.

August Karl Gustav Bier (24 November 1861 – 12 March 1949) was a German surgeon. He was the first to perform spinal anesthesia and intravenous regional anesthesia.