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Mark is now retired after an adventurous career in cartography that has taken him to all but four of the United States and to more than twenty foreign countries. In the early years he learned the practical skills of geodetic surveying, aerial photography, and making high precision measurements from aerial photos and satellite imagery. During the latter part of his career he helped guide the development of digital imagery mapping equipment with a defense contractor and finally with a leading photogrammetric equipment developer. Coming from a practical background, he wrote operator manuals and training materials and has conducted training courses in all six of the populated continents. His travels have provided a wealth of material that permeates his writing. Mark and his wife Jill live in the southern foothills of the Appalachians with their two dogs Heidi and Beauregard.