As a child, Noam Morgensztern followed acting and piano classes in Toulouse. In 2000, as a student of the Cours Simon, he discovered dubbing and lent his voice to a number of films, such as Michael Haneke’s The Pianist and Nanni Moretti’s The Son’s Room. In 2003, he enrolled at the Paris Conservatoire national supérieur d'art dramatique, and, at the same time, trained as a sound technician at the Institut national de l’audiovisuel and studied the principles of classical music and the piano at the Jerusalem Academy of Music and Dance. At the Conservatoire, he played in Shakespeare’s Richard II directed by Andrzej Seweryn, Goldoni’s Les Cancans and La Femme fantasque by Muriel Mayette-Holtz and Strindberg’s A Dream Play by Lukas Hemleb. With Dominique Valadié, he tackled the issues arising from Sarah Kane’s 4.48 Psychosis and worked with Michel Fau on excerpts from Lucrezia Borgia by Victor Hugo. Under the direction of Daniel Mesguich, he interpreted the title role in an excerpt of Chekhov’s Platonov.

In the theatre, he mainly played with the Company Les Sans Cou directed by Igor Mendjisky, such as Le Plus Heureux des Trois and Masques & Nez. He also performed in several shows directed by Victor Quezada, including Petit boulot pour vieux clown by Matei Visniec; Pablo Neruda, il y a cent ans naissait un poète and Victor Jara, a musical homage to the popular Chilean author, composer and performer. In 2007, Noam Morgensztern directed Car cela devient une histoire, a show on the work of Charlotte Delbo and to the music by Franz Léhar.

Noam Morgensztern entered the Comédie-Française in 2013 in order to assume the role of Arlequin on the tour of Marivaux’s Jeu de l’amour et du hasard directed by Galin Stoev. He continued exploring the classical repertoire by performing in Molière’s plays: Claude Stratz’s staging of The Imaginary Invalid (Le Malade imaginaire) and in Hervé Pierre’s staging of George Dandin, as well as in Shakespeare’s Othello directed by Léonie Simaga and The Midsummer Night’s Dream by Muriel Mayette-Holtz. He played in Labiche’s La Dame aux jambes d'azur under the direction of Jean-Pierre Vincent, in Dürrenmatt’s The Visit (La Visite de la vieille dame) directed by Christophe Lidon, in Vania after Chekhov’s Uncle Vanya directed by Julie Deliquet and in Schnitzler’s La Ronde directed by Anne Kessler. Christian Hecq and Valérie Lesort directed him in Jules Verne’s Twenty Thousand Leagues Under the Sea (20 000 lieues sous les mers) and Robert Carsen in Shakespeare’s The Tempest. As part of the Singulis Festival, he put on Au Pays des mensonges, a one-man show based on the short stories written by the Israeli author Etgar Keret.

On film, he has worked with the following directors; Marc-Henri Dufresne in The Journey to Paris (Le Voyage à Paris), and Valérie Donzelli in Que d’amour, an adaptation of Marivaux’s Jeu de l’amour et du hasard. On television, he has been directed by Caroline Huppert in J'ai deux amours, by Amos Gitaï in Plus tard tu comprendras and by Dominique Ladoge in La Loi de mon pays, for which he won the Award for Best Male Newcomer at the La Rochelle Festival in 2011. At the end of 2017, director Benjamin Abitan asked him to embody Tintin in a radio adaptation of Hergé’s book Les 7 boules de Cristal on France Culture radio station.

During the 2018/2019 season, Noam Morgensztern will be performing in Shakespeare’s The Twelfth Night Or What You Will by Thomas Ostermeier, Goldoni’s La Locandiera by Alain Françon, Bergman’s Fanny et Alexandre by Julie Deliquet and in Les Serge (Gainsbourg Point Barre) by Stéphane Varupenne and Sébastien Pouderoux.