His first book was The Fertile Rock: Seasons in the Burren (Collins Press, 2006), which was followed by The West of Ireland(Collins Press, 2009). His next book, The Ireland’s Glorious Landscape, was published by O’Brien Press in Spring 2010 and was followed by The Wild Flowers of Ireland, published by Gill & Macmillan in Autumn 2010, Ireland’s Coast (O’Brien Press, 2012) and The Irish Wildlife Year (Gill & Macmillan, 2012). His latest book, Ireland's Wild Atlantic Way, was published by The O'Brien Press in 2015. His next two books, Ireland's Ancient East and Ireland's Beautiful North were published in 2017. Forthcoming are Ireland's Islands and The Shannon.