John George Bartholomew (1860–1920)
John George Bartholomew brought the firm to prominence. In particular, J.G. Bartholomew made the firm a publisher of its own works, rather than a producer of maps for other firms. He was the fourth John George Bartholomew of this famous map making family. He took over the business at 28 years of age, became Cartographer to King George V and was the founder of the Scottish Geographical Society.