Nammalvar was an Indian green crusader, agricultural scientist, environmental activist and organic farming expert best known for his work on spreading ecological farming and organic farming. He was the author of several Tamil and English books on natural farming, pesticides & fertilizers and was featured in magazines & television programs.
Nammalvar born in an agriculturist family in Thanjavur, Nammalvar got himself a BSc in agriculture from Annamalai University. After the drought of 1983 in many parts of Tamilnadu and the subsequent floods, Nammalvar realised that absence of trees was the cause of both disasters.
He interacted with thousands of disillusioned farmers. Nammalvar was associated with the setting up of Low External Input Sustainable Agriculture (leisa) in 10 districts with 3000 members.