Patrick has always focused his research on parasitic flagellates including those of medical (e.g. trypanosomiasis) and economic (e.g. cryptobiosis) importance. His research and travels, sponsored by numerous international (e.g. FAO, United Nations; NUS, Singapore; MEC, Spain) and Canadian (e.g. MRC; NSERC; IDRC) agencies allowed him to work and to interact with colleagues in Africa, Asia, Europe, and the Americas (North, Central & South), and "ResearchGate" in 2019 listed 50 co-authors from many of his collaborations. His first research program was on ‘trypanosomiasis’ and it included both laboratory and field research; e.g. his studies on human trypanosomiasis were in East & West Africa.
He developed two multidisciplinary research programs (‘biology and systematics of flagellates’; ‘Cryptobia and cryptobiosis’) after his academic appointment @ U of G. The programs with contributions from highly dedicated/talented collaborators (e.g. graduate students, postdoctoral fellows, colleagues) had enjoyed continuous NSERC support from inception, and occasional sponsorships from other national (e.g. NCE; CIDA; IDRC) and international (e.g. FAO, United Nations; NUS, Singapore; MEC, Spain) agencies.
Patrick is also interested in other areas of inquiry which include pathogenic viruses and bacteria in animals; e.g. he founded 'The Roy C Anderson Memorial Lecture in Parasitology', and organized the lecture series for 15 years. Numerous very eminent scientists including a Nobel Laureate had accepted his invitation to present their research on infectious diseases at the University. He, with colleagues also edited several well-received multidisciplinary books on fish diseases and disorders. The U of G Senate elected him University Professor Emeritus after he retired, and it was conferred by the Chancellor at convocation.