Though most of his work has been published in Japan so far, Professor Okishio's articles have had a great impact on the discussion in mathematical economics in the world. This is in particular true for his publications on Marxian Economics, where Professor Okishio has provoked ongoing discussion on the fundaments of the 'Labor Theory of Value', on the controversy over the 'Falling Rate of Profit', and on numerous more detailed subjects of Marxian Mathematical Economics. In addition to this central theme of his work Professor Okishio has also published important articles on quite different topics of economic theorizing. Central themes have here been: trade cycle and growth theory, investment and technical change, class struggle and stagflation, schools of economic thought, planned economies, international trade, and also methodological questions (in particular, dimensional analysis).