1. Prof. Pastor Malabrigo Jr. Ph.D. (College of Forestry and Natural Resources, University of the Philippines Los Baños. The Philippines)

2. Nur Hidayati Ph.D (Department of Biology, Middle Tennessee State University, Murfreesboro, Tennessee)

3. Siti Kusujiarti, Ph.D. (Warren-Wilson College, North Carolina, USA)

4. Ir. Agus Susatya MSc.  Ph.D (Department of Forestry University of Bengkulu)