Budapest-born Bori Keszei made her debut at Debrecen's Csokonai Theatre in 1996, in the role of Barbarina (in Le nozze di Figaro) before going on to sing numerous lyric coloratura roles as a soloist at the National Theatre of Szeged between 1997 and 2001. From the latter year until 2003, at first as a member of the Hungarian State Opera's studio, and later as a regular member of the company, she sang the roles of Adina (L'elisir d'amore), Norina (Don Pasquale), Gilda (Rigoletto), Melinda (Bánk bán) and Susanna (Le nozze di Figaro) there. From 2003 until the birth of her first child in 2008, she was a soloist at the Wiener Staatsoper, where she sang Oscar (Un ballo in maschera), Zerlina (Don Giovanni), Zdenka (Arabella) and Adele (Die Fledermaus). Apart from opera, she has proved her skill in numerous genres, including singing Maria (in West Side Story at the Szeged Open-Air Festival), Rolla (in Miska the Magnate at the Budapest Operetta Theatre) and Svetlana (in 56 Drops of Blood, at the Vörösmarty Theatre in Székesfehérvár).