In their landmark paper published in 1948, Stokes and Robinson (J. Am. Chem. Soc. 1948, 70, 1870-1878) proposed a modified form of the Brunauer-Emmett-Teller (BET) adsorption isotherm to explain the water activity of various concentrated 1:1 and 2:1 aqueous electrolytes. Their pioneering idea of viewing such solutions as an irregular ionic lattice structure inspired much of the author's work from the mid 1980s to the present time. This paper, written in celebration of Prof. Stokes' 90th birthday anniversary, briefly describes the author's contribution toward further development of the theory, its capabilities, and future directions.