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Kei Mori pursued dual research interests as an economist and an engineer. During the 1960s he worked at the Keio University on problems of dynamic economics and anticipated many later developments in this field, both in the construction and application of macrodynamic models. He approached the problem from the point of view of both economics and control engineering. He had advanced ideas at an early stage in computer development about distributed processing, international data management, and control of the dynamic properties of economic systems. As a visiting scholar at the University of Pennsylvania during the late 1960s he participated fully in the new developments there in global model building.During the later years of his life he turned his attention to engineering research, harnessing sunlight for interior plant growth, but he left a lasting impression on economics. These accomplishments are commemorated in this volume by some of his Japanese colleagues and Lawrence Klein with whom he worked at the University of Pennsylvania.This volume contains papers by Kei Mori's colleagues Fumimosa Hamada and Kiroyuki Kosaka who interpreted and analyzed Kei Mori's dynamic models. In addition Mitsuo Saito and associates take up dynamic properties of asset-market models. It is rounded up with active discussions by leading Japanese economic scholars, and a reprinting of one of Kei Mori's original works in econometrics.