Gruenberg was born in Vienna in 1924, the son of Kathrine and Herman Gruenberg.[1][2] He studied in Vienna and at the Jerusalem Conservatory.[3] He was concertmaster of the Palestine Broadcasting Corporation Orchestra from 1938 to 1945. In 1946, he moved to London[1] where he lived until his death, becoming a British subject in 1950. In 1947 he won the Carl Flesch International Violin Competition,[1][3] which at the time came with no monetary prize but international recognition. Gruenberg appeared as a soloist in many countries. He gave the first Russian performance of Benjamin Britten's Violin Concerto, in Moscow.[1] His first concert at the Proms was on 10 August 1955, when he played Bach's Concerto in D minor for two violins, BWV 1043, with Manoug Parikian. He made subsequent performances as a soloist at the Proms in 1961, 1964, 1969, 1970, 1971, 1973, 1975, 1978, and 1982. In a concert at the Proms on 11 August 1971, he played Beethoven's Violin Concerto at the Royal Albert Hall, with the BBC Orchestra conducted by Adrian Boult.[4] In a concert on 24 August 1982, he played the Proms premiere of Alfred Schnittke's Violin Concerto No. 3, conducted by Edward Downes.[5]
Gruenberg died in Hampstead Garden Suburb on 7 August 2020[12] at age 95.[3] Jo Cole, head of strings at the Royal Academy, wrote in a tribute:
... a giant of the violin who made such an enormous contribution to the music profession as a performer, and to the generations of violinists who had the privilege of studying under his guidance at the Royal Academy of Music.[1]