Geographers' Map Company Ltd. (A-Z Maps) was established in London on 25 August 1936. The company's most famous publication, the iconic A-Z Atlas and Guide to London, was created by Phyllis Pearsall, the founder of A-Z, who explored every street in London to create the first edition. Since then, A-Z has become the trusted source for street maps and atlases, as well as developing Visitors' Guides, Road Atlases and the Adventure Map series for walkers. A historian and Sunday Times bestselling author with The Northman's Fury, who studied at Cambridge and Johns Hopkins University. He has written widely on the worlds of late antiquity and the early Middle Ages and his unique panoramic history of the nation was published by Collins: History of Britain in Maps. He lives in London.