Bachelor of Science in Botany, Madurai Kamaraj University, Madurai, India, 1990. Master of Science in Botany, Madurai Kamaraj University, Madurai, India, 1992. Doctor of Philosophy in Botany and Forest Ecology, North-Eastern Hill University, Shillong, INdia, 1997.
Junior research fellow North-Eastern Hill University, 1992—1994, senior research fellow, 1994—1995. Lecturer North Eastern Regional Institute of Science, Nirjuli, India, 1996—2000, senior lecturer, 2000—2005, assistant professor, since 2005. Visiting fellow Jawaharlal Nehru Center Advanced Science Research, Bangalore, India, Rajir Ghandi University, Doimukh, India.
Fellow University Massachusetts, Boston. Member executive board Institute Integrated Resource Management, Tezpur. Member core group on state environment Government Arunachal Pradesh.
Member research advisory board Aaranyak. Member academic committee State Children Science Congress, Arunachal Pradesh. Executive member Institute Integrated Resource Management.
Member research advisory board Rain Forest Research Institute, Jorhat, India, 2002—2003. Member editorial board Journal Food, Agriculture and Environmental, Finland, since 2006, Agriculture, Ecosys. and Environmental, Netherlands, since 2006. Associate editor International Journal Ecological Economics and Statistics, Roorkee, India, since 2006.
Member Environmental Impact Assessment Apraisal Committee, Government Arunachal Pradesh.
Member of National Environmental Science Academy (Environmentalist of Year 2008), International Society Tropical Ecology, International Society Environmental Botanists (life), International Society Conservation Natural Resources (life), National Institute Ecology (life), All Indian Council Technology Education (life), Indian Science Congress Association (life), Indian Society Agroforestry (life), Bamboo Society India (life), Indian Association Tree Sciences (life), Indian Society Soil Biology and Ecology (life), Indian Association Soil and Water Conservationists (life), Arunchal Pradesh Society Land and Water Resources Management (life).
Married Kusum Maithani, September 8, 1996. Children: Prekshaa, Prithvi.