Donald W. Katzner is Professor of Economics and former Department Chair at the University of Massachusetts, Amherst. His published research has spanned several areas, including: microeconomic and general equilibrium theory; the methodology of building models and of analyzing phenomena when measures of appropriate variables are neither available nor reasonably constructible; the analysis of uncertain economic phenomena when it is inappropriate to employ notions of probability; the impact of culture on economic behavior; and organizational issues within the economic firm.