Ernst Ruska is appointed Director of the Institute for Electron Microscopy of the Fritz Haber Institute.

Ernst Ruska works at the German Academy of Sciences in Berlin-Buch in the Faculty of Medicine and Biology.

Ernst Ruska accepts the Technical University of Berlin's invitation to become professor of electron optics and electron microscopy.

Ernst Ruska lectures on the basic principles of electron optics and electron microscopy at the Free University of Berlin.

Ernst Ruska decides to work in industry in the field of electron optics. He is hired by Fernseh Ltd in Berlin-Zehlendorf, where he becomes responsible for the development of television receivers and transmitters, as well as photoelectric cells with secondary amplification. In the meanwhile he continues the development of high-resolution electron microscopes with larger materials with Dr. Bodo von Borries.

Ernst Ruska is born in Heidelberg as the fifth of seven children of Julius Ruska, an Asian studies professor, and his wife Elisbeth Merx.

Ernst Ruska creates the first electron lens under the tutelage of Dr. Max Knoll at the Technical University in Berlin with the idea that electrons, having shorter wavelengths than light, could give better microscopic resolution than optical microscopes. In 1931 he builds the first electron lens, an electromagnet that could focus a beam of electrons just as a lens focuses a beam of light.

Ernst Ruska in his Doctoral thesis investigates the properties of electron lenses with short focal lengths. By using several electron lenses in a series, he invents the first electron microscope in 1933. In this microscope, electrons are sent through a very thin slice of the object under study and are then deflected onto photographic film or onto a fluorescent screen, producing an image that can be greatly magnified.

Ernst Ruska enrols at the Technical University in Berlin, where he is certified as an electrical engineer in 1931.

Ernst Ruska joins Siemens-Reiniger-Werke AG as a research engineer. For this company Ruska realises the first customised electron microscopes (the “Siemens Super Microscope”). His brother, Dr Med. Helmut Ruska, and his colleagues work on its application, particularly in the medical and biological fields. In 1954 Ruska develops "Elmiskop I", the first microscope with a double condenser. This allows routine electron diffraction.

Ernst Ruska receives one half of the Nobel Prize in Physics along with Gerd Binnig and Heinrich Rohrer "for his fundamental work in electron optics, and for the design of the first electron microscope". The electron microscope is one of the most significant research tools devised during the 20th century.

Ernst Ruska enrols to study electronics at the Technical College in Munich.

Ernst Ruska dies after a short illness in West Berlin at the age of 81.