The John B. Pierce Laboratory, Yale University

Tokyo City University, Faculty of Environmental Studies, Dean, Research Professor, PhD

Professor, Beijing Institute of Technology / Hanyang University

Assistant Professor, Department of Geography, Jamia Millia Islamia

Geography and Environment , University of Texas At Austin

International Institute for Earth System Science, Nanjing University

Professor of Civil Engineering, at the International Islamic University Chittagong (IIUC)

Chang'an university

Hanbat National University

Fuzhou University; National University of Singapore (PhD)