He is a registered professional land surveyor in Texas, Maine, and Australia. Jeffress has been one of the original co-principal investigators of the Texas Coastal Ocean Observation Network since 1991, and held the Blucher Chair of Excellence in Surveying from 1990 to 1991. He has held teaching positions in Australia and the US, and has taught short courses in Haiti. Jeffress continues to collect and analyze geographic data and information for land management and development. His research interests incorporate
GIS and digital surveying applications in environmental management,
land titling, and land administration. Jeffress is involved in promoting surveying and GIS education. He organized and coordinated the 2006 GLIS GIS Competition for high school students, sponsored by the Environmental Systems Research Institute (
ESRI). ==References==