Dyfed Elis-GruffyddDyfed Elis-Gruffydd is an Earth Scientist. He studied Geology and Geomorphology at University College London, where his doctoral thesis was on the glacial history of the Brecon Beacons and Carmarthen Fans. He lectured in Geology and Geography at the City of London Polytechnic and also at Trinity College, Carmarthen. He was Head of the Publications Department for the Pembrokeshire Coast National Park Authority, Editor and Publishing Director of Gomer Press and for six years a member of the Executive Committee of the Countryside Council for Wales. He loves exploring Wales, leading walking tours, addressing Welsh societies and walking the glacial and volcanic landscapes of north-west Europe. He is the author of ‘Wales: 100 Remarkable Vistas’ (Y Lolfa, 2017), the original Welsh-language version of which reached the 2014 Wales Book of the Year Creative Non-Fiction shortlist, ‘Rocks of Wales’ (Gwasg Carreg Gwalch, 2019) and ‘Y Preselau – Gwlad Hud a Lledrith’ (Gomer, 2017). He also worked on the ‘Gwyddoniadur Cymru’ (University of Wales Press, 2008) and ‘Geiriadur Cymraeg Gomer’ (Gomer, 2016).