HERBERT L. NICHOLS, JR., devoted most of his business and professional life to earthmoving and heavy equipment. A longtime private consultant, he owned his own excavation and grading business in Connecticut for many years. In addition to his widely translated benchmark work Moving the Earth, he was the author of Excavator Operation, Heavy Equipment Repair, and numerous other books and manuals in the field. He was a member of the American Association of Cost Engineers, the American Institute of Mining Engineers, and the American Welding Society.
DAVID A. DAY P.E., is a consultant with more than 50 years of experience in civil engineering and construction. A graduate of Cornell University and the University of Illinois with a master’s degree in construction and structures, he is the author of Construction Equipment Guide. Mr. Day is also a Life Member of the American Society of Civil Engineers, where he helped start the annual Underground Technology Conference (UTC), and a Life Member of the National Society of Professional Engineers. He lives in Highlands Ranch, Colorado.