Dr. Armstrong completed his PhD in Biochemistry at the University of Melbourne where he was the first to apply metabolomics to the field of ME/CFS (published in 2015), the initial study was on blood and urine, the follow-up study was on stool and gut bacteria in 2017. In 2017 and 2018, Dr. Armstrong began several new projects, extending his Nuclear Magnetic Resonance (NMR) metabolomics knowledge to several international research groups working on ME/CFS. In 2019 he was recruited to join Open Medicine Foundation, as a Science Liaison to communicate between the Collaborative Research Centers as well communicating between them and the broader ME/CFS community. As part of this role, he also works with Stanford University as a Visiting Scholar, to continue his research. Over the course of 2018 and 2019, he developed a hypothesis that ME/CFS results from increased production of reactive nitrogen by-products of energy metabolism and plans to continue to test his hypothesis.