• Sr Principal Scientist, Metal Extraction & Recycling Division
• Guest Editor, Hydro-metallurgy, ELSEVIER, (Sp. Issue, IC-LGO 2015)
• Co-ordinator, S.Korean Internship (E-waste Recycling), NML
• Steering Committee Member of World Recycling Forum
• Dy. Director (Metal Extraction Div.), CSIR National Metallurgical Laboratory, Jamshedpur (Jharkhand), India

• Chairman, B.Brains Development Society, Patna
• Director, Smartway Electronics Pvt. Ltd., Patna
• Incubatee@ Incubation Center, Indian Institute of Technology, Patna

KIGAM, South Korea

HOD, Animal Biotechnology, National Institute of Technology, Rourkla

Professor, Department of Environmental Science, School of Earth, Biological and Environmental Science

Scientist E, Rajendra Memorial Research Institute of Medical Sciences, Patna

Associate Profesor, Dept. of Electrical Engineering, Indian Institute of Technology, Patna

• Former professor in the Faculty of Science, Patliputra University, Patna (Bihar), India
• Former Dean of Science, Patliputra University, Patna (Bihar), India.
• Prof. In-charge/Principal: College of Commerce, Arts & Science, Patna.
• Head of the department of Botany and Biotechnology, College of Commerce, Patna (From 1999 to 2011)

Assistant Professor, Department of Zoology, King Saud University, Riyadh

Associate Professor, Dept. of Physics, College Of Commerce, Arts & Science, Pataliputra University, Patna

Academic Head, Aryabhatta Center for Nano Science and Nano Technology, Aryabhatta Knowledge University, Patna

Dean, School of Mathematics, Statistics and Computer Science Head, Department of Mathematic Central University of South Bihar, Gaya, India

EX – Professor and Head of ECE Department, NIT, Patna

USA Geophysicist, BP, Houston, USA

Research Scientist, Carnomelon University, USA

Professor & Coordinator of M.Sc. Biotechnology Dept. of Botany, Patna University, Patna

Director-n-charge, Zoological Survey of India, Patna

Professor of Biotechnology at Amity Institute of Biotechnology, Amity University Maharashtra (AIB, AUM)

Assistant Professor, Department of Organic and Nano System Engineering, Division of Chemical Engineering, Konkuk University, Seoul, South Korea.

Associate Professor, Department of Bioinformatics , Central University of South Bihar, Gaya