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- 2005 – Present: Assistant Professor School of Geographical Sciences,
Arizona State University
- 2006 - Present: Director, American Society for Phorogrammetry and Remote Sensing - Southwest Region
- 2006 - Present: Membership Chair, American Society for Phorogrammetry and Remote Sensing - Southwest Region
- 2001 – 2005: Assistant Professor, Department of Geography,
University of Oklahoma
- 2001 – 2005: Associate Director, Center for Spatial Analysis,
University of Oklahoma
- 1994 – 1998: Research Specialist, United Nations Environment
Program (UNEP/EAP-AP)
- 1983 – 1992: Deputy Manager, National Forest Management/Inventory
project, (UNDP/FAO/MYA/85/003)
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