Born in 1895, worked from 1920 at the family publishing house, Verlagsanstalt Alexander Koch, which was founded in Darmstadt in 1888 by his father, Alexander Koch. After the Second World War, Alexander Koch jun. became executive director of the publishing house, which had moved to Stuttgart in 1932. He ran the publishing house with his sister, Milly, until his death in 1969.
Verlagsanstalt Alexander Koch earned widespread renown for the periodical Innen-Dekoration (founded in 1890), which is still published today as AIT – Architektur, Innenarchitektur, Technischer Ausbau. Since, like his father before him, Alexander Koch jun. ran the whole show as publisher, general editor, editor and the author of books, his personality essentially moulded everything Verlagsanstalt Alexander Koch published.