Alexandre Jamar was born in 1995 in Paris. After piano studies, he started taking private composition lessons with Allain Gaussin. He then joined the studio of José Manuel Lopez Lopez at Paris Regional Conservatory (CRR), where he also studied orchestration with Anthony Girard. Since September 2020, he studies composition at Paris National Conservatory (CNSMDP) with Gérard Pesson, and new technologies with Yan Maresz, Luis Naon and Grégoire Lorieux.

Having participated to many academies and festivals, he received personal feedback on his music by composers such as Kaija Saariaho, Tristan Murail, Philippe Leroux, Raphaël Cendo, or Joanna Bailie. His music has been performed by the Ensemble l'Itinéraire, the United instruments of Lucilin, the Moscow Contemporary Music Ensemble or the Orchestre de Picardie. In July 2022 he was the laureate of the Elan Award, result of a partnership between the Ircam and the Orchestre national d'Île-de-France. His works are published by the Editions Durand.