Dr. Rajesh Kumar is currently Ramanujan Fellow from DST/SERB, New Delhi, to work independently in Indian Institute of Technology (IIT) Kanpur. He has been awarded prestigious international fellowships as JSPS (Japan Society for the Promotion of Science: Standard) (2018), JAPAN; FAPESP (Sao Paulo Research Foundation) (2017), BRAZIL and Brain Korea-21 (BK-21+) (2014), SOUTH KOREA. He has worked in Toyohashi University of Technology (TUT), Toyohashi, JAPAN as JSPS Fellow (2018–2020). He has also worked in BRAZIL (University of Campinas (UNICAMP) (2015–2017; CNPq postdoctoral fellow/visiting scientist), Campinas & State University of Sao Paulo (UNESP) (2018; FAPESP postdoctoral fellow), Presidente Prudente) and SOUTH KOREA (Korea Advanced Institute of Science and Technology (KAIST) (2012–2014; postdoctoral researcher), Daejeon &, Yonsei University (2014; Brain Korea: BK 21+ Research Professor), Seoul, at different scientific positions.