Mark Tiddeman (fl. c. 1724 - c. 1760) was a British navigator, surveyor, chartmaker, and hydrographer active in the early 18th century. Tiddeman was sailing master of the English ship Tartar. From 1724 to 1728 he completed a hydrographic survey of New York Harbor and the mouth of the Chesapeake. These surveys were eventually adopted by Mount and Page for inclusion in the 1732 fourth book of the English Pilot. On returning to England Tiddeman completed several surveys of the Highlands of Scotland for Admiral Wagner, who was then stationed on the Coast of Scotland. On March 27th of 1741 he was commissioned as a Lieutenant in the Royal Navy. He later became a Captain and piloted several ships to and from the British West Indies. More by this mapmaker...

George Grierson (1680 - October 27, 1753) was an Irish printer and publisher active in Dublin during the first part of the 18th century. Grierson began publishing when he married Jane Blow, a daughter of the prominent Irish paper making and publishing family of James Blow. In 1727, he was admitted as a Freeman to the city of Dublin and was appointed to the office of Printer General to His Majesty in Ireland. Operating under the title, 'Kings Printer in Dublin' from 1732 to 1753, Grierson was the only printer in Dublin allowed to print Holy Bibles. Later Grierson's attention turned toward cartography, which he identified as a profitable sideline to Bible work. Most of Grierson's cartographic work involved pirating the work of the prominent English eccentric and map publisher Herman Moll. Grierson's first 'Moll' piracies were published shortly following Moll's death in 1732. Though superficially identical to the maps in Moll's The World Describ'd, Grierson's maps are in fact complete re-engravings, often with new cartouche work bearing unique ‘Irishcentric' dedications and themes. Grierson also issued piracies of The English Pilot and Salmon's Modern History. Although George Grierson can be credited with few original maps, his work established Dublin as a center for cartographic engraving and publication in the 18th century. Today's Grierson's Irish versions of Moll's maps are far rarer than Moll's own work and are highly sought after by collectors. Following his 1753 death George Grierson's son, Boulter Grierson, took over the business, beginning a family printing dynasty that would last well into the 19th century. Grierson's offices were located at the 'Sign of the Two Bibles and King's Arms', Essex Street, Dublin. Learn More...