Conductor and kierownictwo muzyczne of the Teatr Wielki im. Stanislawa Moniuszki, Poznan production of Rossini Semiramide, premiere 28 May 1994, per the Encyklopedia Teatru Polskiego: https://encyklopediateatru.pl/przedstawienie/24554/semiramide and his person page https://encyklopediateatru.pl/osoby/9615/andrzej-borejko . Entered under the name the Polish sources and the tape use. He is very probably the conductor known internationally as Andrey Boreyko, whose Polish name Wikipedia gives as "Andrzej Borejko" (https://en.wikipedia.org/wiki/Andrey_Boreyko), but nothing found ties Boreyko to Poznan under either name, so the two are left as separate names rather than asserted to be one person.