[1] His thesis was about a city of Toruń lawyer Krystian Bogumił Steiner (1746–1814).
[1] In 1959 he began working at the Jagiellonian University, where he finished his habilitation in 1966 with a thesis about criminal law of the enlightened absolutism era.
[1] From that year he moved to Nicolaus Copernicus University in Toruń, where he served as the vice dean.
[1] In 1970 due to his ties to another historian, Paweł Jasienica, he was arrested for anti-governmental activism by the Polish communist authorities of the People's Republic of Poland and fired from the university in the next year.
[2] Salmonowicz received a medal for "Deeds for City of Toruń" (Za Zasługi dla Miasta Torunia)[1][3] and the Cross of Freedom and Solidarity in 2012.