1990: Elias James Corey for development of the theory and methodology of organic synthesis.

1991: No American winner.

1992: Rudolph A. Marcus for his contributions to the theory of electron transfer reactions in chemical systems.

1993: For contributions to the developments of methods within DNA-based chemistry, Kary B. Mullis for his invention of the polymerase chain reaction (PCR) method, and Canadian Michael Smith for his fundamental contributions to the establishment of oligonucleiotide-based, site-directed mutagenisis and its development for protein studies.

1994: George A. Olah for his contribution to carbocation chemistry.

1995: Americans Mario J. Molina and F. Sherwood Row-land, and Paul J. Crutzen of the Netherlands, for their work in atmospheric chemistry, particularly concerning the formation and decomposition of ozone.

1996: Americans Robert F. Curl Jr. and Richard E. Smalley, and Sir Harold W. Kroto of Great Britain, for their discovery of fullerenes.

1997: Americans Paul D. Boyer and John E. Walker, of Great Britain, for...