John Coupe is a structural engineer who has designed buildings ranging in size from domestic extensions to multi-storey residential and commercial developments using steel, concrete, masonry and timber. Alex Johnson is a freelance journalist (largely with The Independent since 2007) and author of various books including Shedworking (Frances Lincoln, 2010), Bookshelf (Thames & Hudson, 2010), and Improbable Libraries (T&H 2015). John's website secrets-of-shed-building.com and Alex's at shedworking.co.uk together reach around 800,000 readers a year.