- 2023/04 - 現在 The University of Calicut Science Distinguished Professor
- 2023/03 - 現在 Indian Institute of Technology Hyderabad Chemistry Visiting Professor
- 2016/02 - 現在 Hokkaido University Graduate School of Environmental Science Professor
- 2016/02 - 現在 Hokkaido University Research Institute for Electronic Science Professor
- 2016/04 - 2019/03 Nagoya University Graduate School of Engineering Visiting Professor
- 2010/04 - 2016/01 Nagoya University Graduate School of Engineering Visiting Associate Professor
- 2010/04 - 2016/01 AIST, Japan Health Research Institute Senior Researcher
- 2012/04 - 2014/03 Osaka University Graduate School of Engineering Science Visiting Scholar
- 2011/10 - 2013/09 Southern University, USA Environmental Toxicology Adjunct Professor
- 2010/04 - 2013/03 Kwansei Gakuin University School of Science Department of Chemistry Visiting Lecturer
- 2008/04 - 2012/03 Kerala University Center for Arthropod Bioresources and Biotechnology Visiting Professor
- 2004/08 - 2010/03 AIST, Japan Health Research Institute Research Scientist
- 2007/07 - 2007/08 University of Texas at Austin, USA Department of Chemistry and Biochemistry Visiting Scientist
- 2003/05 - 2004/08 Pacific Northwest National Laboratory, Department of Energy, USA Fundamental Science Directorate Postdoctoral Fellow
- 2002/03 - 2003/05 Nanotechnology Research Institute, AIST, Japan Nanotechnology Research Institute JSPS Postdoctoral Fellow
- 2000/04 - 2002/03 Angstrom Technology Partnership, Tsukuba, Japan Single-molecule Bioanalysis Laboratory Postdoctoral Fellow
- 1998/12 - 2000/03 CSIR-RRL (NIIST), Trivandrum, India Photochemistry Division Senior Research Fellow (SRF)
- 1995/12 - 1998/12 CSIR-RRL (NIIST), Trivandrum, India Photochemistry Division Junior Research Fellow (JRF)
- 1995/10 - 1995/12 Intelligence Bureau of India North Block new Delhi Intelligence Officer