Professor, Texas A&M University

University of South Australia, Adjunct Associate Professor University of Waterloo

The Hong Kong Polytechnic University, School of Hotel and Tourism Management

Ph.D Candidate ,Department of Art and Architecture ,IAU,West Tehran Branch,Tehran,Iran

Profssor of Tourism Studies, Peking University

Universität für Bodenkultur Wien

Professor of Tourism, Leisure and Event Planning, Bowling Green State University

Professor in Leisure and Tourism Management

professor of tourism planning, Eastern Mediterranean University

University of Tehran