John Prasanth Jacob, Ph. D is a Scientist with the Indian Council of Forestry Research and Education, Ministry of Environment, Forests & Climate Change, Government of India. He has thirty years of experience as a Forest Entomologist. His interest is management of forest insect pests based on the principles of insect-plant interactions. He has worked on the host plant resistance to key pests of economically important plantation species like teak, casuarina and eucalyptus. He has worked extensively on the invasive gall wasp in eucalypts and has played a major role in its successful classical biological control in India for which he was awarded by National Bureau of Agricultural Insect Resources (ICAR), Bangalore. He has obtained a patent for volatile lure for trapping eucalyptus gall wasp. He has conducted three national level Workshops on Eucalyptus gall wasp. He has authored the following books:- (1) Foresters Manual on Nursery Pests and Their Management (2) Insect Pests of Medicinal Plants and Their Management (3) Introduction to Field Oriented Forest Entomology and (4) Insect Pests of Trees Outside Forests and Their Management. He has executed various research projects funded by National Forestry Research Programme, Department of Science and Technology and National Medicinal Plant Board.