Love (1978). The opening track of the latter album, "Sign Of The Times", was used as the theme tune of radio DJ Frankie Crocker and became Callier's only US chart success, reaching No. 78 on the R&B chart in 1979. The single prompted his appearance at the Montreux Jazz Festival, where Mizell presented him in the Elektra Jazz Fusion Night showcase alongside Grover Washington, Dee Dee Bridgewater and Lee Ritenour. When Mizell moved on to work with Stevie Wonder in 1980, Callier was dropped from the label. Callier continued to perform and tour until 1983, when he gained custody of his daughter and retired from music to take classes in computer programming, landing a job at the University of Chicago and returning to college during the evenings to pursue a degree in sociology. He re-emerged from obscurity in the late 1980s, when British DJs discovered his old recordings and began to play his songs in clubs. Acid Jazz Records head Eddie Piller reissued a little-known Callier recording from 1983, "I Don't Want to See Myself (Without You)", and brought him to play clubs in Britain. From 1991 he began to make regular trips to play gigs during his vacation time from work. In the late 1990s Callier began his comeback to recorded music, collaborating with Urban Species on their 1997 EP Religion and Politics and contributed to Beth Orton's Best Bit EP in 1997 before releasing the album Timepeace in 1998, which won the United Nations' Time For Peace award for outstanding artistic achievement contributing to world peace. His colleagues at the University of Chicago did not know of Callier's life as a musician, but after the award the news of his work as a musician became widely known and subsequently led to his dismissal by the University. As well as touring internationally, Callier continued his recording career, releasing five albums after Timepeace, including Lifetime (1999), Alive (2001), Speak Your Peace (2002), featuring Paul Weller on the single "Brother to Brother", Golden Apples of the Sun (2003), featuring the words of W. B. Yeats' poem The Song of the Wandering Aengus, and Lookin' Out (2004). May 2009 saw his album Hidden Conversations featuring Massive Attack released on Mr Bongo records. In 2001, Callier performed "Satin Doll" for the Red Hot Organization's compilation album Red Hot + Indigo, a tribute to Duke Ellington, which raised money for various charities devoted to