Mattan was born and raised in Jerusalem. He studied at the Rubin Academy in Jerusalem and had graduated with honours from the Berklee College of Music in Boston. He is the winner of the 1st prize in the 2018 international ‘7 Virtual Jazz Club Web Community Award’. His original compositions have also earned awards such as the John Lennon Song Writing Contest and the USA Song Writing Competition. 

The Long Run, Mattan’s latest project, features several his regular musicians, including Toki Stern (Rhodes), Yoni Ben Ari (bass) and Joca Perpignan (percussion), with special guest Nitzan Bar (guitar). Mattan’s music has been described by Yossi Harsonsky, Senior Music critic at Maariv, as, “flowing, bright and listener friendly…his flute sound is clear, crispy and melodic, and the Israeli-Brazilian mix is the ultimate contemporary jazz sound, spiced with warm, unique flute sounds…Klein's virtuoso improvisation lifts Jazz-flute playing to new heights."