1. Forestry Study Program, Faculty of Forestry, Universitas Sumatera Utara, Kampus USU 2 Bekala, Deli Serdang, Indonesia
2. Natural Resources and Environmental Management Study Program, Graduate School, Universitas Sumatera Utara, Kampus USU Padang Bulan, Medan, Indonesia
3. Agroecotechnology Study Program, Faculty of Agriculture, Universitas Sumatera Utara, Kampus USU Padang Bulan, Medan, Indonesia
4. Member of Belawan Watershed Forum, Medan, Indonesia