Jacek was born in 1966 and raised in Gdynia, which is a city located in Poland on the south coast of the Baltic Sea. He was educated at the Medical University of Gdansk. Still as a medical student, and already advanced recreational diver, he joined the research group in the newly created Hyperbaric Centre of the Institute of Maritime and Tropical Medicine in Gdynia doing research on saturation decompression on nitrox, heliox and trimix, so his MD thesis was devoted to modelling of extremely long decompressions using different breathing gases. Later on, Jacek completed full clinical training in anaesthesia and intensive care and worked for several years in the Department of Anaesthesiology of the Medical University of Gdansk, still cooperating with the hyperbaric group in Gdynia.
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