Raja Gopal Rayavarapu received his Ph.D. in 2010 from the University of Twente, Enschede, The Netherlands, for the development of gold nanorods as molecular probes for light-based imaging techniques. Further, he did his postdoctoral research at the Institute for Molecules and Materials, Radboud University Nijmegen, The Netherlands, from 2010 to 2012. Later, in 2014, he joined the Nanomaterial Toxicology Laboratory at the CSIR-Indian Institute of Toxicology Research, Lucknow, as a Senior Scientist. Since 2019, he is working as a Principal Scientist at the CSIR-Indian Institute of Toxicology Research, Lucknow, India, where his main core research is on developing rapid and facile protocols for synthesizing tunable sizes of metal nanoparticles for imaging, sensing, and therapeutic applications. He is a lifetime member of the Indian Society of Nanomedicine. He also received the prestigious Young Scientist grant from the Department of Science and Technology from 2015 to 2018.