Stephen Louis Nardelli (born 10 April 1948 in London) founded the Syn in 1966 with Chris Squire, Martyn Adelman and others.
In 1968, Nardelli left the band for a business career in the fashion and sports industries before reforming the band in 2003 with Adelman and Peter Banks.
Banks left the reunited band, but Squire joined and the band recorded a new album, Syndestructible.