Via Instrumental Casting, Jay appears as a violinist in commercials for T-Mobile and iPhoneX, on TV shows Better Things and Nip Tuck and in music videos for Hilary Roberts 'Fight to the Other Side' and Aloe Blacc's 'Love is the Answer' which is also featured in a Lincoln car commercial. Also via Instrumental Casting, Jay performed with an orchestra to a sold out crowd at the Dolby Theater in Hollywood with Persian Artist Shahkar and guest artist Andrea Bocelli. Jay has also played numerous live engagements, recording work and a concert with Grammy Award winner, Hamid Saeidi via Instrumental Casting.
Jay has also performed with LA Curbside Entertainment.
At the age of 9, Mr. Hallmark was invited by Lord Yehudi Menuhin to study at the Menuhin School in England, where he participated in over ninety performances and tours scheduled per year. At the age of 14, Mr. Hallmark won first place in the British Young Artists Competition. Since graduating from Julliard in 1994, with his Masters of Music Degree, Mr. Hallmark has been much sought after as a chamber musician and chamber orchestra player. He is a co-founder of the Concertante Chamber Players based in New York, performs regularly with the ProArte Chamber Music Consortium in Guanajuato, Mexico, and has been concertmaster of the Aspen Valley Chamber Orchestra, in Colorado, for 11 years.