Guszalewicz studied singing at the Lemberg conservatory with Walery Wysocki, and later with J. Gänsbacher inn Vienna.
Guszalewicz made his debut im 1891 in Preßburg (Bratislava).
After Preßburg, he sang at the Stadttheater in Aachen, the Stadttheater in Brünn (Brno), and during 1896-1902 at the German Theater
In Prag, he sang the title role in the premiere of Der arme Heinrich by Hans Pfitzner. and in 1901 took part in the world premiere
of Der polnische Jude by K. Weis.
In 1896, he married his student the soprano Alice Guszalewicz (1879-1940), who had a succesful career as a dramatic soprano and
was a member of the Kölner Opernhaus, where both lived.
Starting in 1902, Guszalewicz was no longer a member of an opera houses and undertook guest appearances in and out of Germany:
Budapest (1895), Kroll-Oper (Berlin, 1892), Lemberg (Lwów, 1893, 1902), Frankfurt a.M. (1901),
and Bern(1903). He sang up to his time of death.
Guszalewicz was at the beginning a lyric tenor, that developed into a dramatic tenor singing Manrico, Raoul, Assad,
Otello, Tannhäuser, Canio, Manru, Eléazar, Ernani, ...
His daughter Genia Guszalewicz (1902-71) had, like her parents, a successful career.
He recorded for Zonophone, including a duet with Alice Guszalewicz.
Reference: Kutsch & Riemens