The son of a ship building engineer volunteered after the completion of the Prima maturity at the secondary school Bremerhaven from 1897 to 1900 at a shipbuilding company. After his military service in the Imperial Navy in 1903 he put a high school as an external student and studied until he graduated as an engineer in 1904 at the Technical University Berlin industrial administrative nature. In addition to the study of economics, philosophy and history at the Friedrich- Wilhelms-Universität Berlin Koch worked from 1905 to 1907 at AEG. 1907 doctorate Waldemar Koch with a thesis on the concentration movement in the German electrical industry to Dr. phil. In the years 1905-1907 he undertook study tours to the U.S., China and Russia. Koch received his doctorate in 1909 with a thesis on the industrialization of China to Dr. -Ing.
From 1910 to 1914 Waldemar Koch worked as a director of a AEG- operation in London. During the First World War he served from 1914 to 1915 military service. After that, he was until 1918 Head of Department and then Deputy Director of the Institute of Shipping and World Economy, University of Kiel. In 1918, Koch was a member of the German Democratic Party ( DDP). In his capacity as Chairman of the Civic Committee of Greater Berlin from 1918 to 1919, he supported the volunteer regiment under Colonel Wilhelm Reinhard in the suppression of the Spartacist uprising. In the years 1919 to 1930 Koch worked in various industries. 1930 Habilitation cooking for Business Administration at the Technical University of Berlin and then worked until 1945 as a freelance accountant.
1934 Waldemar Koch represented as an auditor of the interests of the Jewish major shareholder of Engelhardt Brewery Ignatz Nacher against the linearisation willing Dresdner Bank. That's why he was taken for three weeks in protective custody. Then was deprived of the right to teach and dismissed him after § 6 professional Civil Service Law as a lecturer at the Technical University Berlin. After they had given him permission to teach in 1939, he took in 1942 and 1943 a lectureship at the University of Halle true.
In June 1945, Waldemar Koch was the main initiator of the foundation and from July first chairman of the Liberal Democratic Party of Germany. Due to intra-party quarrels in particular on the issue of land reform and at the instigation of the Soviet Military Administration in November 1945, he was already the chair to Wilhelm Külz from. 1948 Koch was expelled from the LDP, moved to West Berlin and became a member of the Free Democratic Party. From 1949 to 1953 he lectured as a professor of business administration at the Technical University of Berlin. In 1956 he resigned from the FDP.
- Joachim Heintze: The redesign of company law and reorganization of a oHG in a corporation. German economists -Verlag, Berlin 1948.
- Fundamentals and technology of distribution. Volume 1: Organization of the sales department. Volume 2: market research. Financial -Verlag, 1950.
- The development of the German economy since 1945 and part payment of their problems. Duncker & Humblot, Berlin 1956.
- High school problems (Business Administration ). Duncker & Humblot, Berlin 1956.
- The profession of auditor. Duncker & Humblot, Berlin 1957.
- From the memoirs of an industrial engineer. Cologne, Opladen 1962.