1. Head of Nanotechnology Research Center, Military Technical College (MTC), Egyptian Armed Forces, Cairo, Egypt
2. School of Chemical Engineering, Military Technical College (MTC), Egyptian Armed Forces, Cairo, Egypt
3. Chemical Engineering Department, British University in Egypt (BUE), Cairo, Egypt
4. Drug Radiation Research Department, National Center for Radiation Research and Technology (NCRRT), Egyptian Atomic Energy Authority (EAEA), Cairo, Egypt