Dave Doyle has been involved in geodetic surveying since 1967. He joined the National Geodetic Survey in 1972 and functioned in various positions dealing with national adjustments and datum transformation and outreach to the surveying and geospatial community. He held the position of chief geodetic surveyor for 12 years prior to his retirement in 2013. He now owns Base 9 Geodetic Consulting Services which provides consulting to public and private agencies and companies as well as teaching seminars on the fundamentals of geodesy and the National Spatial Reference System. He is a Past President of the American Association for Geodetic Surveying, and is an active member of the DC, Maryland and Virginia professional surveyors’ associations. He has published more than 30 technical articles on geodesy and at the 2011 TUgis conference he was honored with an Outstanding Contributions to GIS in Maryland award by Dr. J Morgan.