He studied at the Conservatoire de Paris with Jean Sulem,[1] and further with Jesse Levine at Yale University, and with Tabea Zimmermann.

[2] He has performed at such venues as the Royal Concertgebouw, the Vienna Musikverein, and Carnegie Hall and with the Santa Cecilia Orchestra in Rome [14 March 2019].

[2] Tamestit premiered several contemporary compositions, including Thierry Escaich's La Nuit des chants, Bruno Mantovani's Concerto pour deux altos et orchestre and Olga Neuwirth's Remnants of songs… an Amphigory and Weariness heals Wounds.

[5] In 2015, he premiered Jörg Widmann's Viola Concerto, which was commissioned by him, with the Orchestre de Paris and Paavo Järvi.

[6][7] Tamestit played chamber music with Emmanuel Ax, Isabelle Faust, Martin Fröst, Leonidas Kavakos, Yo-Yo Ma, Emmanuel Pahud, Francesco Piemontesi, Cédric Tiberghien, Yuja Wang, Jörg Widmann, Shai Wosner, and the Ébène Quartet.