Jack L. Koenig (1933–2021) was an American chemical engineer noted for pioneering spectroscopic methods of polymer characterization. He played a significant role in developing characterization methods to provide fundamental structure-property relationships for polymers used in thermoplastic and thermoset systems. Koenig was elected a member of the National Academy of Engineering in 2000 for applications of spectroscopic methods of polymeric materials. Source: Wikipedia (en)