Hanna Maria Pappius (1925-2023), distinguished scientist, board member of the Polish Institute of Science in Canada. Born in Kujawy, she came to Canada from London in 1940. She studied at McGill University, obtaining a master's degree in 1948 and a doctorate four years later. In 1953, she joined the Donner Laboratory of Experimental Neurochemistry. After a few years, she became the first female professor in the Department of Neurology and Neurosurgery and the Department of Biochemistry at McGill University. For almost seventy years, she conducted research on brain swelling and the effects of brain injury on neurotransmitter and receptor mechanisms. She has published more than 100 scientific articles. She has also co-authored a book entitled Brain Electrolytes and Fluid Metabolism, now considered a classic in the field. She has trained many experts who are now internationally renowned neurologists. After retiring in 1995, she served as chair of the Animal Care Committee - Neurological Institute (until 2016), and was co-chair of the Research Ethics Board there for more than a decade. Since her studies, Prof. Pappius has been closely involved with the Polish Institute of Science. From 1988 to 2015, she served as Director of the Polish Library and also as Vice President of the Institute. Prof. Hanna Maria Pappius received the Order of Canada (Member) in recognition of her research in neurochemistry and her work for the Polish-Canadian community, as well as for her fight for animal rights.