As a researcher, he is working in Manufacturing Systems and Supply Chain Management domain. His research and teaching interests include modeling the Manufacturing Processes and Operations analysis in Supply Chain Networks. Optimization, Simulation, and Computational Intelligence are the main techniques adopted by Prof. Tiwari to automate the decision support system for complex and large-scale problems in the Manufacturing and Logistics System. Several national and international research funding agencies and industries have supported his research interests.

Prof. Tiwari has published over 370 papers (H Index: Google Scholar–87 & Scopus-65, Citations: Google Scholar–31569 & Scopus-19533) in highly reputed International Journals. He was rated as Rank 1 among the top 100 individual researchers worldwide who published research articles in the International Journal of Production Research during 1985-2010. He is also mentioned as a leading author in the Supply Chain Analytical Techniques field by the Journal of Computer & Industrial Engineering. Recipient of the “Most Influential Researcher Award” in the domain of Operations and Supply Chain Management. He is the Recipient of the David F. Baker Distinguished Research Award (IISE, USA, 2023) and the Mahalanobis Distinguished Educator Award from the Operations Research Society of India (ORSI)