People

Current: Christopher Williams  | Natalia Hasler | Tong Jiao | Yu Zhou | Surendra Shrestha | Li Xi

Former: Listed Below


Chris Williams


508.793.7323
CWilliams [at] clarku.edu

B.A., Biology/Environmental Studies, Bucknell University (1996)
M.S., Watershed Science, Colorado State University (2000)
Ph.D., Environmental Science, Duke University (2004)

Professor Christopher A. Williams joined the faculty in the Graduate School of Geography in Fall 2008. Prior to coming to Clark University he was a Research Scientist at Colorado State University’s Natural Resource Ecology Laboratory, followed by faculty appointment as Assistant Research Scientist with the Goddard Earth Sciences and Technology Center of the University of Maryland Baltimore County and based in the Biospheric Sciences Branch of NASA’s Goddard Space Flight Center.

More about Chris here

Detailed CV

Google Scholar Page

ResearchGate Website

Natalia Hasler


508.421.3862
NHasler [at] clarku.com

B. Eng, M.S., Environmental Engineering, École Polytechnique Fédérale de Lausanne (1995)
Ph.D., Atmospheric Sciences, École Polytechnique Fédérale de Lausanne (2002)

Dr. Hasler’s research is broadly centered on land-atmosphere interactions, with detailed focus on a) precipitation response to land cover changes such as deforestation and conversion to agriculture, and b) determining controls on terrestrial water and carbon dioxide exchanges with the atmosphere. She employs a variety of methods including synthesis of flux-tower observations, regional climate simulation (RAMS), and general circulation modeling. Presently, she is assisting our group with mapping and monitoring forest carbon stocks across forests of the conterminous US and modeling seasonal and interannual variability of surface-atmosphere exchange of carbon dioxide.

Detailed CV

Tong Jiao


TJiao [at] clarku.edu

B.S. Geographic Information System, Beijing Forestry University (2011)
M.S. Quantitative Remote Sensing, Institute of Geographic Sciences sand Natural Resources Research (2014)
Ph.D. Geography, Clark University (graduated December 2020)

Tong Jiao earned a B.Sc. in GISci from Beijing Forestry University in 2011 and a follow-on M.S. in Quantitative Remote Sensing in 2014. Her master’s study examined the mapping of global seasonal forest background reflectivity with MISR data. Her research interests focus on the investigation of forest ecosystem carbon, water, and energy dynamics by using field measurements, remote sensing, and modeling.

Yu Zhou


YuZhou2 [at] clarku.edu

B.S. Remote Sensing Science & Technology, Shandong University of Science and Technology (2012)
M.S. Cartography & GIS, Institute of Remote Sensing and Digital Earth, CAS (2014)
Ph.D. Geography, Clark University (expected mid-2021)

Yu Zhou earned a B.S. in Remote Sensing Science & Technology from Remote Sensing Science & Technology in 2012 and a follow-on M.S. in Cartography & GIS from Institute of Remote Sensing and Digital Earth (Chinese Academy of Sciences) in 2015. Her Master’s study examined the carbon cycling on grassland in Central Asia. Her research interests focus on the ecological modeling, ecosystem carbon and water cycling, global change, human-environment interactions, remote sensing.

Surendra Shrestha


SShrestha [at] clarku.edu

B.S. Forestry, Institute of Forestry, Tribhuvan University, Nepal (2009)
M.S. Forest Resources, University of Georgia (2016)
Ph.D. Geography, Clark University (expected 2022)

Surendra Shrestha is interested in impacts of land use and climate change on hydrology, land-atmosphere interactions. His Master’s research examined hydrological impacts of land use and land cover changes in Georgia, as well as land use changes related to increasing demand for wood pellets in the US South. During Bachelor studies in Nepal, Surendra performed thesis research assessing the status of forest condition and plant diversity in a a community forest of Puranchaur VDC of the Kaski District.

Li Xi


LXi [at] clarku.edu

B.A. Geography with Highest Honors, Binghamton University, State University of New York (2016)
M.A. Geography, Binghamton University, State University of New York (2019)
Ph.D. Geography, Clark University (expected 2024)

Li Xi’s is interested in impacts of forest disturbance, forest conversion, and reforestation on the terrestrial carbon cycle and climate. Her approach involves a combination of detailed high-resolution mapping with remote sensing datasets coupled with forest carbon modeling and albedo assessments to study large-scale radiative forcing. Her Master’s research examined subpixel urban impervious surface mapping with Landsat imagery, as well as detecting urban land cover change. She has experience with coding batch processing of Landsat time series stacks, with writing algorithms for detecting land change, with assessing training data, and with a range of machine learning, random forest, and similar analytical techniques. She has investigated how the assessment of impervious surface extent varied with atmospheric corrections, with climate conditions, and with seasonal effects.

Former Members

Post-doctoral Research Scientists
Dr. Huan Gu (2015-2018)
Dr. Myroslava Khomik (2012-2013)
Dr. Bardan Ghimire (2012)
Dr. Christopher Schwalm (2008-2011)

PhD Students
Tong Jiao (PhD Geography ’20)
Richard MacLean (PhD Geography pursued)
Melanie Vanderhoof (PhD Geography ’14)
Bardan Ghimire (PhD Geography ’12)

MS Students
Savannah Cooley (MS GISci ’17)
Alexander Kappel (MS GISci ’14)
Marcus Pasay (MS ES&P ’13)
Graham Twibell (MS ES&P ’11)

BA Students
Caroline Williams (BA ES ’20, Thesis Advisor)
Tyler Anderson (BA ES ’18, NOAA Fellowship Advisor ’17)
Spring Pillsbury (BA ES ’17, Honors Mentor & Committee ’17)
Saira Khan (BA Geog ’16, NOAA Fellowship Advisor ’15)
Corey Dickinson (BA Geog ’15, Geller Fellowship Advisor ’15)
Melat Seyoum (BA minor Geog ’15, Internship Advisor ’15)
Evan Marshall (BA Geog ’14, Internship Advisor ’14)
Lucas Earl (BA Geog ’14, NOAA Fellowship Advisor ’13)
Thorsen Akerely (BA ES ’13; Summer Fellow ’12)
Alexander Kappel (BA ES ’13; NSF REU ’12)
Marcus Pasay (BA ES ’12; NSF REU ’11)
Krittika Govil (BA ES ’11; Summer Fellow ’10)
Angela Marshall (BA ES ’11; Honors)
Michelle Smith (BA Geog ’11; NSF REU ’09)
Graham Twibell (BA ES ’10; NSF REU ’09)

NSF REU Mentees via Harvard Forest LTER Program
Alayna Johnson (’14)
Joshua Alaniz (’14)
Lowell Chamberlain (’13)
Rebecca Walker (’13)
Paul Quackenbush (’12)
Katherine Chute (’11)
Crystal Garcia (’10)