Stefanie Krahnenfeld received her professional training at the Folkwang School in Essen. Her two years of graduate study at the Manhatten School of Music in New York were made possible by a scholarship from the DAAD (German Academic Exchange Program). She earned there her Master of Music degree under Professor Marlena Malas.

Her Opera Studio appearances in New York included the roles of Violetta in Verdi's La Traviata and Ginevra in Handel's Ariodante. She performed in concerts in New York together with artists such as Marilyn Horne, Ruth Ann Swenson and Warren Jones.

With a scholarship from Israel Vocal Arts Institute, she appeared in Tel Aviv as Konstanze in Mozart's Entführung aus dem Serail and as Armida in Handel's Rinaldo.

Stefanie Krahnenfeld received Third Prize in the ARD-Competition in 2000.

The soprano was a member of the ensemble at the Saarland State Theatre in Saarbrucken (1999-2011).  Her repertoire includes lyric and dramatic coloratura roles such as Norma, Lucia, Desdemona (Otello), Liu (Turandot), Norina (Don Pasquale), Olympia/Antonia/Giulietta (Tales of Hoffmann), Donna Anna, Fiordiligi, Konstanze, Pamina, Ilia (Idomeneo), Sophie (Der Rosenkavalier), Frau Fluth (Lustige Weiber von Windsor), Cleopatra (Giulio Cesare), Ann Truelove (Rake’s Progress). She had guestcontracts with the Komische Oper Berlin and the Staatstheater Stuttgart, Staatstheater Braunschweig etc. At the Bregenz Festival 2001/2002 she sang the part of Musetta and participated in the 2003 production of Cunning Little Vixen.  In 2004/2006 she was again Musetta in Francesca Zambellos La Bohème at the Royal Albert Hall in London. Stefanie sang Infanta (The Dwarf) for Opera North and Donna Anna for Grange Park Opera in 2005. In 2007 she was contracted to sing  Lucia for L’Opera de Tours.

In addition to her opera appearances, Stefanie Krahnenfeld is active in oratorio and concert work, guesting with the Royal Philharmonic Orchestra, Bochum Symphony, the Tschaikowsky Orchestra of The Moscow Radio, the Neuss Chamber Academy, the Bavarian Radio Symphony Orchestra, the SWR Radio Orchestra and the Radio Symphony Orchestra Saarbruecken. She has given song recitals in Germany, Israel, Canada, USA and China.

She worked with the following conductors: Rudolf Barshai, Ulf Schirmer, Olaf Henzold, Lothar Zagrosek, Vladimir Fedoseyev, David Parry, Anthony Inglis, Will Humburg and the following stage directors: Francesca Zambello, Karoline Gruber, David Pountney, Richard Jones, Daniel Slater. Stefanie is currently a student of Gerald Moore in London.