Born in 1986, Alphonse Cemin studied piano and flute at the CNR of Boulogne-Billancourt, analysis at the CNR of Paris (Alain Louvier) and harmony with Jacques Castérède before joining the CNSMDP in the classes of musical culture (Brigitte François Sappey) and analysis (Michaël Levinas) then piano accompaniment (Jean Koerner and Jean-Frédéric Neuburger), and chamber music (Pierre-Laurent Aimard). He works on the repertoire of melody and song with Ruben Lifschitz, Helmut Deutsch and Jeff Cohen, and follows conducting courses in workshops and master classes with Lawrence Foster and the orchestra of the Gulbenkian Foundation in Lisbon.

Alphonse Cemin is one of the founders of the ensemble Le Balcon with whom he presents the music of composers of his generation as well as a wide repertoire from the last centuries. In September 2015 he directed Michael Lévinas' opera La Métamorphose at the Musica festival in Strasbourg and in 2016 the premiere of the opera Tomas Bordalejo Bureau 470. 2017 he was assistant conductor at the Bolshoi Theatre in Moscow for George Benjamin's opera Written on skin. In recital he regularly performs with soprano Julie Fuchs with whom he recorded the early melodies of Mahler and Debussy (aside), and also with Damien Pass, Marianne Crebassa, Léa Trommenschlager, Manuel Nuñez-Camelino, Nahuel di Pierro, Rodrigo Ferreira, Kate Lindsey, Stanislas de Barbeyrac, Élise Chauvin, Jenny Daviet, Anna Stephany. He has also performed in recital with Karine Deshayes, Inva Mula and Béatrice Uria-Monzon.

Since 2014, he has been the artistic director of the Lundis musicaux de l'Athénée season, devoted to chamber repertoire for voice and piano. He recorded Schumann's Myrthen op 25 (B Records) with Léa Trommenschlager and Damien Pass, with Mari Eriksmoen a Grieg, Grøndahl, Strauss, Wolf record. (Alpha) and with the quartet Van Kuijk and Kate Lindsey La Chanson Perpétuelle by Chausson (Alpha). As a chamber music partner he has performed with Jean-Guihen Queyras, Emmanuel Pahud, Paul Meyer, Olivier Charlier, the Modigliani Quartet, Fanny Clamagirand, the Zaïde Quartet; in ensemble and orchestra he has performed under the direction of Pierre Boulez (Pierrot Lunaire), Peter Eötvös, David Robertson, Mathias Pintscher with the Ensemble Intercontemporain, the Mahler Chamber Orchestra; has performed as soloist 2nd concerto and variations Paganini by Rachmaninov, 20th concerto by Mozart.

He has performed on stages in the Salle Pleyel, Arsenal de Metz, Opéra Garnier, Grand Théâtre de Bordeaux, Auditorium du Louvre, Opéra de Nantes, KKL-Luzern, Kumho Art Hall (Seoul), Villa Médicis, Palazzetto Bru-Zane-Venice, the Auditorio Nacional de Madrid, Florida International University-Miami and the Aix-en-Provence festivals, Cartagena international music festival, Folle journée de Nantes, Folle journée Tokyo, Musique à l'Empéri, Musica de Strasbourg, Cordes-sur-ciel.

He also works as music director, assistant conductor and vocal conductor on opera productions and, in 2010-11, at the opera workshop of the Opéra national de Paris. This activity has him collaborating with conductors such as Esa-Pekka Salonen, Kent Nagano, George Benjamin, Marc Minkowski, Daniel Harding, Pablo Heras-Casado, Marc-André Dalbavie and working at the Salzburger Festspiele, Festival d'Aix-en-Provence, Bayerische Staatsoper München, Théâtre Capitole in Toulouse, Opéra Comique Paris, Bolchoï Téatr Moscou.

In 2010, he was the HSBC prize-winning pianist at the Academy of the Aix-en-Provence Festival and in 2013 received the performance prize from the Stockhausen Kurse Kürten. In 2017 he received the Gabriel Dussurget prize from the Aix-en-Provence festival.