2007, O'Regan began dividing his time between the UK and the US when he was appointed Fellow Commoner in the Creative Arts at Trinity College, Cambridge, a position he held until 2009. During his tenure at Cambridge, his composition Threshold of Night won the Liturgical category of the 2007 British Composer Awards and Scattered Rhymes, his first CD on the Harmonia Mundi label, performed by the Orlando Consort and the Estonian Philharmonic Chamber Choir conducted by Paul Hillier, was released in 2008. O'Regan's second disc on the Harmonia Mundi label, Threshold of Night, appeared in late 2008 and awakened a wider interest in his work, demonstrated by the CD garnering two GRAMMY Award nominations in 2009: Best Classical Album, Best Choral Performance. After this, he increased his output as a music commentator in print and on air, especially on BBC Radio 3 and BBC Radio 4. This aspect of his career broadened with the broadcasting in 2010 on BBC Radio 4 of Composing New York, a documentary written and presented by O'Regan. In the same year, he was appointed to the Institute for Advanced Study in Princeton as a Director's Visitor and made his BBC Proms debut with Latent Manifest performed by the Royal Philharmonic Orchestra. O'Regan's third album on the Harmonia Mundi label, Acallam na Senórach: an Irish Colloquy (based on the 12th century Middle Irish narrative of the same name) was released in October 2011. 2011–present: Heart of Darkness, Mata Hari, The Phoenix and other works for the stage In 2011, Heart of Darkness, O'Regan's chamber opera in one act, with an English-language libretto by artist Tom Phillips, based on the novella of the same name by Joseph Conrad was premiered at the Linbury Theatre of the Royal Opera House. The idea for the opera first came to O'Regan in 2001. It received wide critical attention and marked his first foray into operatic writing. A suite for orchestra and narrator was extrapolated from the opera and was given its London premiere by the Royal Philharmonic Orchestra and actor Samuel West in April 2013. In May 2015, Heart of Darkness received its North American premiere in a production by Opera Parallèle, presented by Z Space in San Francisco, California. Since the opera, O'Regan composed several pieces influenced by North Africa, which include his first collaborations with both the Dutch National Ballet and the Australian Chamber Orchestra. Recently, some of