In 2002 his book Ojcobójcy (Patricide) was released providing the first analysis of Poland's new theatre. In 2007 he published Szekspir i uzurpator (Shakespeare and the Usurper), a collection of interviews with theatre director Krzysztof Warlikowski (also released in France and Romania). He co-authored Mr Warlikowski's theatre productions, including (A)pollonia, Tramwaj (Tramway), Koniec (The End), Opowieści afrykańskie według Szekspira (African Stories After Shakespeare), Cabaret warszawski (Warsaw Cabaret), and Francuzi (The French). Mr Gruszczyński has acted as dramaturge for the Nowy Theatre in Warsaw since 2008. He also works with Mariusz Treliński on the latter's opera productions, contributing to Boris Godunov, Orfeo ed Euridice, La Traviata, Turandot, The Flying Dutchman, Manon Lescaut, Iolanta & Bluebeard's Castle. He is a lecturer of the Faculty of Theatre Studies, Warsaw Academy for the Dramatic Arts and the University of University of Social Sciences and Humanities (SWPS) in Warsaw.
(photo: archives of the Teatr Wielki – Polish National Opera)
