Prof. Rajender Varma (H-index 144, highly cited res. 2016, 18, 19, 20, 21, 22) born in India (PhD, Delhi University 1976) has been a Senior Scientist at U.S. EPA since 1999. He has over 50 years of multidisciplinary research experience ranging from eco-friendly synthetic methods using microwaves, ultrasound, etc. to greener assembly of nanomaterials and sustainable appliances of magnetically retrievable nanocatalysts in benign media. He is a member of the editorial advisory board of several international journals, published more than 1000 papers, and awarded 17 U.S. patents, 11 books, 31 book chapters and 3 encyclopedia contributions with 85,700 citations.