Greg Bauer is one of the principles of Colog Geophysics in Lakewood, CO. He has been involved in borehole geophysics for over 20 years. His company has performed geophysics throughout the United States, in South America, Madagascar, Canada, and Greenland. Mr. Bauer's most significant contribution to borehole geophysics was his participation in the development of hydrophysics which allows precise definition of borehole fluid productivity and flow direction.