professor of plant cell biotechnology and pharmacognosy, Leiden University

University of Medicine and Pharmacy "Carol Davila", Bucharest

Professor University of Sargodha Pakistan & Universiti Putra Malaysia

Johns Hopkins University School of Medicine

Professor University of Pretoria

Distinguished Professor of Medicinal Phytochemistry University of Nizwa

Lecturer Natural Products Chemistry, Wageningen University

Dipartimento di Farmacia, Università di Pisa

James Hutton institute

Universidade do Vale do Itajai - UNIVALI