Miller was born and raised in Kingston, Jamaica. He read English at the University of the West Indies, but dropped out short of graduation. However, while studying there, he befriended Mervyn Morris, who encouraged his writing. Afterward, Miller began publishing widely throughout the Caribbean. In 2004, he left for England to study for an MA in Creative Writing (The Novel) at Manchester Metropolitan University under the tutelage of poet and scholar Michael Schmidt. He later completed a PhD in English Literature at the University of Glasgow. In 2006, his first book of poetry was released, Kingdom of Empty Bellies (Heaventree Press). It was shortly followed by a collection of short stories, The Fear of Stones, which partly explores issues of Jamaican homophobia. It was shortlisted in 2007 for a Commonwealth Writers' Prize in the category of Best First Book (Canada or Caribbean). His second collection of poetry, There Is an Anger That Moves, was published in 2007 by Carcanet Press. He is also the editor of Carcanet's New Caribbean Poetry: An Anthology (Carcanet Press, 2007). He has been a visiting writer at York University in Canada, at the Department of Library Services in the British Virgin Islands and a Vera Rubin Fellow at Yaddo. Miller currently divides his time between Jamaica and the United Kingdom. Until 2014, he was Reader at the University of Glasgow. He currently teaches Creative Writing at Royal Holloway, University of London.