In 1895 Robinson set up his own map-publishing business in Wentworth Court, moving in 1906 to Phillip Street and in 1913 to permanent location at 221-223 George Street. In November 1917 H. E. C. Robinson Ltd was officially incorporated with seven share-holders and Robinson as managing director. Business flourished, especially during World War I when there was a demand for maps showing the progress of the war. From the 1920s Robinson published a notable series of maps of the pastoral stations of New South Wales, Queensland, Victoria and South Australia. H. E. C. Robinson’s soon became a byword for maps throughout Australasia; as well as its wide variety of sheet, wall and special purpose maps, atlases and street directories, its ground-floor George Street shop sold a large range of imported maps. In 1925 the firm took over the Premier Street Guide and developed it as Sydney’s leading guide. Robinson was also the largest partner in the Australian Guide Book Co. Ltd, but relinquished his controlling interest to Cecil Gregory by deed of gift shortly before his death, thereby giving rise to Gregory’s Guides and Maps Pty Ltd.