This chapter traces the development of the pricing research program of Kent Monroe, beginning with his doctoral dissertation and continuing to the present time. Drawing on psychophysics and adaptation-level theory the early research efforts concentrated on validating two important concepts relative to behavioral pricing research: reference price and acceptable price range. Then the behavioral pricing research program expanded to explore how the context of a purchase situation, including the structure of the prices available for judgment, influences buyers' price perceptions and willingness to buy. In the early years his research included pricing models and research on patronage behavior. Subsequently, concentrating primarily on behavioral pricing research, he began to integrate findings from the research program into examining how various sellers pricing strategies and tactics influence buyers' judgments and purchase decisions. These efforts led to the first edition of his book Pricing - Making Profitable Decisions published in 1979. The book was subsequently revised and expanded in 1990 and again in 2003.