1. Chairman & Cofounder: Global Institute of Stem Cell Therapy and Research (GIOSTAR), San Diego, CA. USA.
2. Visiting Associate Researcher: Department of Molecular, Cell and Development Biology, University of California Los Angeles (UCLA), CA, USA.
3. Visiting Researcher: Department of Stem Cell Biology, Sanford Burnham Prebys Medical Discovery Institute, San Diego, CA, USA.
4. Senior Scientist: Stem Cell Core Facility, The Salk Institute of Biological Studies, La Jolla, CA, USA.
5. Associate Project Scientist: Department of Stem Cells and Neurology, School of Medicine, University of California Irvine (UCI), Irvine, CA, USA.
6. Assistant Project Scientist: Cancer Center, School of Medicine, University of California San Diego (UCSD), La Jolla, CA, USA.
7. Visiting Fellow: National Research Institute (NRI), Nansei, Mie, Japan.

Additionally, Dr. Srivastava has contributed to stem cell programs, and has guided stem cell policies and programs for the following governments and private organizations:

1. Helped stem cell core facility at The Salk Institute of Biological Studies, San Diego, USA
2. Worked for the stem cell program at the University of California, Los Angeles (UCLA), USA
3. Worked for Japanese Research Institute (JRI) for developing the genomic program, Japan
4. Guided scientists in developing stem cell programs for Turkey, Kuwait and Saudi Arabia
5. Stem Cell Program Director of GIOSTAR for the State of Gujarat, India
6. Stem Cell Program Director of GIOSTAR for the State of Madhya Pradesh, India
7. Stem Cell Program Director of GIOSTAR for the State of Chhattisgarh, India
8. Stem Cell Program Director of GIOSTAR for University of Baroda, Gujarat, India
9. Stem Cell Program Advisor for Asian Medical Institute, Kyrgyzstan