Pianist, chambrist, opera correpetitor and composer, he performs as a soloist at festivals in Leipzig (Germany), Alkmaar (Netherlands) or in Paris, where he was invited to the Chopin Festival of the Orangerie du Parc de Bagatelle. He played in chamber music at the Festival de la Roque d'Anthéron, at the Festival Pianos en la Calle (Spain), at the Festival Les Vacances de Monsieur Haydn in La Roche-Posay or at the Cziffra festival in Unieux.

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He founded the Trio Aralia with Iris Scialom, violin and Magali Mouterde, cello, in residence at ProQuartet - European Center for Chamber Music . They are invited for a residency at the Château de Lourmarin, for a tour in Russia (partnership with Live Music Now), and perform at the La Roque d'Anthéron piano festival, at the Vue d'Ensemble(s) festival and at the Festiville (Villefavard-en-Limousin farm), at the Palais de Compiègne, at the Jean-Jacques Henner museum in Paris, at the New Jerusalem museum (Russia), or at the RNCM in Manchester. Their interpretation of Ravel's trio at the Niewe Kerk in The Hague (Netherlands) was broadcast on Radio West.

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Composer, his work “Fragments Épars I” for an ensemble of 13 instruments, commissioned by the Paris Conservatory, was premiered there as part of a tribute to Debussy under the aegis by Florent Boffard. His duo “Toothbrush”, commissionned and created by the cellist Michel Strauss and the tap-dancer Max Pollak, was acclaimed at the Chamberfest of Ottawa (Canada). His lyric poem for soprano and piano trio « L’Envers du Miroir », lyrics by Marc Henric, was premiered by Trio Aralia and Delphine Guévar at the Conservatoire de Saint-Ouen in October 2021.

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He takes part in 2021 the production Résønance(s) with the soprano Faustine Picco, the tenor Tristan Fourault et the composer Michel Bosc, around the lyric recital. Going beyond the traditional conventions, with a brand repertoire including musical extracst (West side story) or traditional (Heitor Villa-Lobos, Yann-Fañch Kemener), Résønance(s) proposes public a widely open approach of lyric recital and creation to the audience.

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Théodore Lambert is a collaborative pianist at the "Gabriel Fauré" Conservatory in Paris and collaborates with director Christine Morel and Sophie Chiu to play vocal and choral pieces for young audiences (Children's crusade, B. Britten; Le tour du monde en 80 jours, V . Gerboullet) and with the System 20 + vocal ensemble.

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As a correpetitor he works with Catherine Dune for "La Cenerentola" de Rossini at the Conservatoire du 12e arrondissement of Paris and with numerous teachers (Louchia Nigohossian, Valérie Guillorit, Robert Expert, Marie Atger...), agencies et companies (La Tempête, Adagio Artists...)

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A Banque Populaire Foundation laureate, supprted by the Mécénat Musical Société Générale, the Meyer Foundation, the ADAMI, the Daniel and Nina Casso Foundation, Oriolis and Chantal Jacquet, Théodore Lambert was awarded at the Concours des Virtuoses du Cœur, at the International Chopin Competition in Brest, or at the International Competition Claude Bonneton de Sète.

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A graduate of the Conservatoire National Supérieur de Musique de Paris in the classes of Denis Pascal, Emmanuel Strosser, Jean-Frédéric Neuburger, Claire Désert and Ami Flammer, he also works with Bertrand Chamayou, Jacques Rouvier, Paul Badura-Skoda, Eric Heidsieck, Pavel Gililov, Matti Raekallio, or Claudio Martínez Mehner. Also interested in historically informed performance, he worked with Kristian Bezuidenhout, Alexeï Lubimov or Edoardo Torbianelli. He's benn taught by Günter Pichler, founder and 1st violinist of Alban Berg quartet at the Instituto Superior de Musica de Camara de Madrid (Escuela Superior de Musica Reina Sofia).