In 1932–39, Szweykowski held a professorship at the Free Polish University (Wolna Wszechnica Polska) in Warsaw and Łódź.
[2] During the World War II Nazi occupation of Poland, he participated, at the risk of his life, in underground university teaching in Warsaw.
His books in this field included Powieści historyczne Henryka Rzewuskiego (The Historical Novels of Henryk Rzewuski, 1922) and Trylogia Sienkiewicza (Sienkiewicz's Trilogy, 1961).
[1] Beginning in 1948, Szweykowski produced monumental editions of Prus' collected Pisma (Writings).
[1] He also edited Krystyna Tokarzówna's and Stanisław Fita's exhaustive Bolesław Prus, 1847-1912: Kalendarz życia i twórczości (Bolesław Prus, 1847-1912: a Calendar of [His] Life and Work), Warsaw, Państwowy Instytut Wydawniczy, 1969.