While a graduate student at Fordham University, Professor Rummo taught several sections of undergraduate organic chemistry laboratory. After graduation, he taught organic chemistry as an adjunct professor at Nyack College of the Bible in Rockland County, NY. His industrial experience includes working for Dynamit Nobel as an environmental chemist, an organic chemist working on terpene chemistry, and as a technical service representative for oil field chemicals. He co-authored a patent for a series of titanium and zirconium organometallic compounds used in hydraulic fracturing ("fracking"). In 1987 he became the CEO of New Chemic (US) Inc. The company markets active pharmaceutical ingredients (APIs) to the animal health industry. His other passion is writing, and before moving to Florida in 2017, he wrote a regular column and numerous feature-length articles for several North Jersey Media Group publications. He is currently a contributing writer for the Cornwall Alliance for the Stewardship of Creation, a network of evangelical Christian scholars–mostly natural scientists, economists, policy experts, theologians, philosophers, and religious leaders–dedicated to educating the public and policymakers about Biblical earth stewardship. He leads an annual missionary trip to Peru, working together with members of Wycliffe Bible Translators and AWI, an indigenous Quechua evangelical group. Participants spend a week trekking in remote areas of the Andes Mountains, visiting villages where they show "The Jesus Film" and distribute bilingual New Testaments. Professor Rummo frequently weaves science and scripture together in his classes. In his own words, "It is noteworthy that the father of classical physics, Sir Isaac Newton, and the father of quantum physics, Max Planck, were both able to seamlessly integrate faith and science. Belief in God did not present a contradiction to their understanding of the design and the mechanics governing the respective worlds they studied. They both believed that God is the Ultimate Designer, 'For in him all things were created: things in heaven and on earth, visible and invisible ...He is before all things, and in him all things hold together'" (Colossians 1:16-17).