Arrested in 1940 by the NKWD he spent 18 months in Soviet camps.

In the years of 1908–1913 Zalewski constructed biplane WZ I and its 20 hp engine.

In 1912 he constructed with his brother Bolesław monoplane WZ II.

During the interwar period Zalewski built biplane WZ VIII (1919), reconnaissance aircraft WZ X (1923–1926), sports plane WZ XI (1927) and the first Polish four-engined heavy bombing plane PZL.3 (1928–1930; built in France as Potez 41) made in PZL.

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