Throughout 60’s and 70’s he performed on stage, first in Kabaret Wagabunda (with Lidia Wysocka, Maria Koterbska, Mieczysław Czechowicz and Bogumił Kobiela, among others), afterwards in a programme Popierajmy się (with Bohdan Łazuka, Tadeusz Ross, Piotr Szczepanik and Ryszard Markowski).
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Fedorowicz was one of the founders (together with, among others, Zbigniew Cybulski and Bogumił Kobiela) of the student theatre in Gdańsk named Bim-Bom (between 1954 and 1960).