Chemical Engineering in Mexico and South America. He was a visiting professor at the Universidad Nacional de La Plata in Argentina in 1962, at the Universidad Nacional Tecnológico de Celaya in Mexico in 1983, and at the Universidad Autónoma de México in 1985. At these institutions he lectured in Spanish. For 18 years he was an editorial advisor for the Latin-American Journal of Chemical Engineering and Applied Chemistry. Following that, he held a similar position for Latin-American Applied Research.

Warren Stewart was well known for his sly sense of humor and his ability to produce, instantly, jokes on just about any topic. He loved puns and had a warning sign on his desk given to him by colleagues: “Incorrigible punster—don’t incorrige.”

Warren loved his family and was devoted to them. He is survived by his wife, Jean; six children, Marilyn (Jim) Weaver, David, Douglas, Carol (David) Ray, Margaret (Kurt) Straus, and Maru Jean (Bruce) Glasgow; 18 grandchildren, Katherine, Thomas, and Rebecca Weaver, Jenny Kershner-Stewart, Joanna, Andrea, Rachel, Daniel, Susanna, and Abigail Ray, Gretchen, Eric, Madeline, and Zachary Straus, Johathan, Caroline, Andrew, and Jeffrey Glasgow. He is also survived by two sisters-in-law, Virginia and Helen Stewart, and one brother-in-law, John Potter; many nieces and nephews, cousins, and other relatives.