During medieval times, cobalt (the name actually comes from the German word "kobalt", meaning “goblin”) was considered as valuable as silver or copper ore. Today, cobalt is known mainly for its role as an alloying component for special kinds of steels. More recently, however, cobalt has been increasingly important for its role in the field of electro-mobility, leading to a rapid increase in demand. Cobalt is also one of the few transition metals that is important for humans in the form of vitamin B12. In recent history, the properties found in cobalt compounds as mediators/catalysts to produce organic compounds have been rediscovered time again, leading to a boom in synthetic chemistry. JKU professor Marko Hapke (Institute of Catalysis, INCA) and Prof. Gerhard Hilt (University of Oldenburg), both of whom are involved in conducting research on cobalt complexes as sustainable catalysts, edited a new book titled "Cobalt Catalysis in Organic Synthesis: Methods and Reactions" taking this development into account. This is the first monograph focusing on all of the exciting facets in the use of cobalt compounds in catalysis and producing organic substances.