Born in Milano, Ruben Jais, while studying Medicine at Universitŕ Statale, graduated at Conservatorio Giuseppe Verdi of his own town in Choral Music and Choir Conducting' and Vocal Polyphonic Composition' both degrees with Honour. At the same Conservatorio he also graduated in Composition and studied Orchestra Conducting, continuing hi studies then with Master classes abroad.
From 1998 to 2007 he was Chorus Master of the Coro Sinfonico Giuseppe Verdi di Milano
. In such a role he worked with musicians such as Romano Gandolfi, Riccardo Chailly, Claudio Abbado, Luciano Berio, Oleg Caetani, Claus Peter Flor, Christopher Hogwood, Vladimir Jurowski, Helmut Rilling, among the others.
He is the Resident Conductor and Head of the Artistic Department of the Orchestra Sinfonica Giuseppe Verdi di Milano
He holds several cycles of concerts with a vast repertoire expanding from baroque to contemporary music. He also conducts Discovery Concerts where, together with performing the repertoire, he gives speeches to explain to the audience the story and the structural aspects of the different compositions with music examples.
In 2008 he founded LaVerdi Barocca, ensemble devoted to the performance of baroque and classical repertoire on period instruments; with such ensemble he holds a concerts season at the Auditorium di Milano, seat of the Verdi Foundation, performing from XVI century to early classical period music.
He is the Music Director of the Mailänder Kantorei, the German Music Ensemble of Milano, with which he performs the German repertoire from baroque to romantic, including the performance of J. S. Bach's Sacred Cantatas Cycle and Passions.
He conducts instrumental, choral and symphonic music for several Italian and international institutions such as Biennale di Venezia, Teatro Comunale di Bologna, Milano Musica, Teatro alla Scala, RTSI Lugano, Budapest Hungarian Radio, Saint Moritz Festival, Teatro Real de Madrid, Orquesta National de Cile, UiS Stavanger Norway, international organ festivals.