Mariusz Szajnert was born and raised in Lodz, Poland. He began teaching Polish as a Second Language at the Lodz University after completing his MA degree in Polish Literature and Theory of Literature.
He emigrated to Belgium in 1986 and finally to the United Sates in 1989, where he became a citizen in 1995. He lived in Chicago working as a teacher and a freelance Polish-English and English-Polish translator between 1989 and 2001. In 2001 he moved to the Detroit area, where he is currently an assistant professor at Madonna University, works as a freelance translator and interpreter, and conducts private classes in Polish and English as Second languages. He is a commentator on a Polish radio station and contributes to Polish language periodicals both in the United States and abroad.