Professor, Ohio State University

São Paulo State University (Unesp), School of Agriculture, Botucatu

Associate Research and Extension Professor, Mississippi State University

Balai Penelitian dan Pengembangan Teknologi Perbenihan Tanaman Hutan

Isparta Uygulamalı Bilimler Üniversitesi / Isparta University of Applied Sciences

Indian Council of Forestry Research and Education

Ph.D. in Plant Eco-physiology from L'université d'Avignon

Extension Assistant Professor

The Ohio State University

Universitas Negeri Gorontalo