- Assistant Research Professor, Department of Geographical Sciences, University of Maryland
- Associate Research Professor, Department of Geographical Sciences, University of Maryland
- Senior Research Fellow, Global Risk Governance Programme, University of Cape Town
- Associate Research Professor, Department of Geographical Sciences, University of Maryland
- Professor, University of Valencia
- Senior Faculty Specialist, Department of Geographical Sciences, University of Maryland
- Associate Research Professor, Department of Geographical Sciences, University of Maryland
- Professor, Department of Geographical Sciences, University of Maryland
- Senior Faculty Specialist, Department of Geographical Sciences, University of Maryland
- Associate Professor, Department of Geographical Sciences, University of Maryland
- Adjunct Professor, Department of Geographical Sciences, University of Maryland
- Faculty Specialist, Department of Geographical Sciences, University of Maryland
- Emeritus Research Scholar, IIASA
- Research Professor, Department of Geographical Sciences, University of Maryland
- Research Professor, Department of Geographical Sciences, University of Maryland
- Professor, Department of Geographical Sciences, University of Maryland
- Adjunct Associate Professor, Department of Geographical Sciences, University of Maryland
- Professor, Department of Geographical Sciences, University of Maryland
- Assistant Professor, Department of Geographical Sciences, University of Maryland
- Professor, Department of Geographical Sciences, University of Maryland
- Research Professor, Department of Geographical Sciences, University of Maryland
- Professor, Department of Geographical Sciences, University of Maryland
- Principal Faculty Specialist
- Associate Professor, Department of Geographical Sciences, University of Maryland
- Associate Research Professor, Department of Geographical Sciences, University of Maryland
- Professor, University of Bern
- Research Professor, Department of Geographical Sciences, University of Maryland
- Regional Representative (Asia), Malaria Consortium
- Professor, Department of Geographical Sciences, University of Maryland
- Senior Researcher, Department of Software for Space Systems and Interactive Visualization, DLR
- Associate Research Professor, Department of Geographical Sciences, University of Maryland
- Assistant Professor, Department of Geographical Sciences, University of Maryland
- Emeritus Professor, UMD and Chair Professor, University of Hong Kong
- Associate Professor, Department of Geographical Sciences, University of Maryland
- Professor, Department of Geographical Sciences, University of Maryland
- Assistant Professor, Department of Geographical Sciences, University of Maryland
- Associate Professor, Vietnam National University Hanoi
- Post-Doctoral Associate, Department of Geographical Sciences, University of Maryland
- Assistant Professor, Department of Geographical Sciences, University of Maryland
- Assistant Professor, Department of Geographical Sciences, University of Maryland