Herbert A. Simon (1916–2001) American political scientist, economist, sociologist, and psychologist
Source: 1980s and later, "Why a diagram is (sometimes) worth ten thousand words," (1987), p. 71, as cited in: Bauer, Malcolm I., and Philip N. Johnson-Laird. " How diagrams can improve reasoning http://mentalmodels.princeton.edu/papers/1993diags%26reasoning.pdf." Psychological Science 4.6 (1993): 372-378.