 Einfeld's paternal grandfather was the Reverend Marcus Einfeld (1874-1937), who came to Australia in 1909 (becoming the "chazan" and the Second Minister of the Great Synagogue) by way of London, England, to which he had immigrated from Jarosław in Galicia with his wife Deborah (née Gabel; d. 1957).Einfeld attended Sydney Boys High School from 1951 to 1955.He then obtained his Bachelor of Laws degree from the University of Sydney in 1962.