Born in Strasbourg, France, Antoinette Dennefeld’s artistic education began at a very young age, and included piano, theatre and dance. After two years at the University Marc Bloch in Strasbourg, she enters the Haute Ecole de Musique in Lausanne in 2006. During her studies, she participated in masterclasses with Dale Dusing, Christa Ludwig and Luisa Catsellani. She received the Mosetti grant two times (2008-2010) and the Richard Wagner scholarship (2009).

She graduated from the Haute Ecole de Musique in Lausanne and received her Master of Music (Voice) in 2011 with high honors. For her excellent results, she received the Max Jost Award, Friends of the OSR Award and the Paderewski Prize. Teh same year, she won the «Grand Prix» at the International Singing Competition of Marmande and the Third Prize and Public's Choice at the International Singing Competition of Geneva. She also recieved in 2011 an advanced career development grant from the Leenaards Foundation.

In concert, she has performed the solo parts in Vivaldi’s Gloria, Rossini’s Stabat Mater, Mozart’s Requiem and Haendel’s Dixit Dominus both in Switzerland and France. In Lausanne, she sang the alto solo part in Bach’s St. John Passion with Ton Koopmann and the soprano solo in Stravinsky’s Pulcinella with the Orchestre de Chambre de Lausanne. With the Sinfonietta of Lausanne, she performed the mezzo role in Prokofiev’s Alexander Nevsky and has also sung Lieder from Mahler’s Knabenwunderhorn. Since 2009, she has been performing in recitals with the pianist Lucas Buclin as Duo Almage (http://duo-almage.com). In 2012, they recorded pieces by Poulenc, Aboulker, Wolf, Britten and Strauss for the Société Vaudoise des amis de l'Orchestre de la Suisse Romande.

In opera, she has performed Donna Elvira in Don Giovanni at the Théâtre du Jorat in Mézières, Contessa di Ceprano and Giovanna in Rigoletto at the Avenches Opera Festival, Charmion in Massenet’s Cléopatre at the Opera of Marseille and Dorabella in Così fan tutte at the Opera Tenerife. With the Opera of Lausanne, the Second Lady in die Zauberflöte, the Second Witch in Dido and Aeneas, Zulma in l'Italiana in Algeri, Stéphano in Roméo et Juliette, Venus in Orphée aux Enfers, Fanny Elssler in Honegger and Ibert's L’Aiglon and Louise in Varney’s les Mousquetaires au Couvent (at both Opéra de Lausanne and Opéra Comique). At the National Opera of Lyon she has been invited as La chatte/L'écureuil in Ravel's L'Enfant et les Sortilèges and most recently as Isolier in Rossini’s Le Comte Ory. Last summer she xas invited by the Maggio Musicale Fiorentino to be Rosina in Rossini's Barbiere di Siviglia. More recently she sang Annio in La Clemenza di Tito at the Opéra de Montpellier and Jean in Le Portrait de Manon by Massenet in Marseille.

This season, she will return to Lyon to be Cunégonde in a new produciton of Offenbach's Le Roi Carotte staged by Laurent Pelly, will sing for the first time Charlotte in Werther alongside with Celso Albelo, and will make her debut at Opéra National de Paris singing Flora in Verdi's Traviata.