I have 32 years of experience, and specialize in the field of geographic information systems (GIS) and geographic positioning systems (GPS) with specific knowledge in the areas of environmental concerns, computer programming and technical writing. I have published on such topics as GIS and GPS, computer programming and urban and regional planning. I have extensive experience in teaching and writing about GIS and in using the GPS to derive information for GIS. I am a computer programmer and understand how computers do what they do.