- In 1974 year he co-founded The Hilliard Ensemble along with fellow vicar-scholar Paul Elliott, and David James, who probably knew Elliott when they were both at Magdalen College, Oxford . He was for a period the group's musical director, until he left, around 1989 .
- In 1989 he founded Theatre Of Voices (spelled Theater in US releases), which record on the Harmonia Mundi USA label. With this group he explores more contemporary repertoire.
- When Hillier became the director of the Early Music Institute he became director of The Pro Arte Singers, who put out a couple of recording with Theatre of Voices. He was director until he left the Institute in 2003 .
- In 2001 Hillier became Artistic Director and Principal Conductor of the Estonian Philharmonic Chamber Choir (EPCC) {Link without Title}
Hillier has also recorded a number of solo albums, some with harpist Andrew Lawrence-King .
He has recorded under the harmonia mundi, ECM, EMI, Finlandia, and Hyperion labels.
Hillier has had numerous academic appointments over the years, starting in 1980 , and most recently as director of Indiana University Bloomington 's Early Music Institute , but has always returned to performance.
- ''The Catch Book'' ( 2005 ), Oxford University Press, ISBN 0193436493 - a collection of catches, or comic Rounds edited by Hillier.
- ''A Josquin Anthology'' ( 2005 ), Oxford University Press, ISBN 0193532182 - a collection of choral pieces by the notable Renaissance composer, edited by Ross Duffin and Hillier.
- ''Writing on Music, 1965-2000'' ( 2002 ), Oxford University Press , ISBN 0195111710 - a collection of writings by Steve Reich , edited by Hillier.
- '' Arvo Pärt '' ( 1997 ), Oxford University Press, ISBN 0198166168 - The only English-language biography of the famed Estonian composer.
- ''English Romantic Partsongs'' ( 1986 ), Oxford University Press, ISBN 0193436507 - a collection of songs edited by Hillier.
- ''300 Years of English Partsongs: Glees, Rounds, Catches, Partsongs 1600-1900'' ( 1983 ), Faber & Faber , ISBN 0571100457 - a collection of music edited by Hillier.
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