Shri Unmesh D. Malshe, after completing B.E. in Mechanical Engineering discipline from Shivaji University in 1990, joined 34th batch of BARC training school. After completing one year training in nuclear science and engineering, he joined Reactor Engineering Division (RED) of Bhabha Atomic Research Center (BARC) in 1991. During the career span of more than 32 years in Bhabha Atomic research Centre, Shri Unmesh D. Malshe has been involved in number of multifaceted activities in nuclear sector.

After joining RED, he started his career with activities associated with life management of coolant channels of Indian PHWRs. These activities primarily included predicting residual life of the coolant channels, suggesting measures to extend the operating life and implementing the same. These activities also included developing remotely operable mechanical systems facilitating life extension of the coolant channels.

Shri Malshe was involved in assessing India specific nuclear power growth scenarios in a scientific manner. This included economic assessment as well.

From March 2015 till end of 2023, Shri Unmesh D. Malshe served as Head of Engineering Design and Development Division to lead the development of systems and components for fabrication of radioactive nuclear fuels of different reactors. In January 2017, he was given additional responsibility as Head of Computational Analysis Division at BARC Visakhapatanam. The team of Computational Analysis Division has been developing computational tools for variety of applications including modeling radiation damages in materials, high strain rate phenomenon resulting from impact and shock, simulating chemical processes, material property estimations from first principle calculations.

Shri Unmesh D. Malshe has planned, executed and reviewed various projects facilitating the establishment of infrastructure for a range of activities pertaining to DAE programme.

Since July 2023, Shri Malshe in different capacities as Associate Group Director and as Group Director in BARC, was assigned responsibilities to lead the activities of developing systems for Proton Accelerator programme of Department of Atomic Energy. He is also serving as Technical Coordinator for activities associated with Indian Institutions and Fermi Lab Collaboration.

Currently, along with Group Director in BARC, Shri Unmesh D. Malshe is Director, Raja Ramanna Centre for Advanced Technology. Shri Malshe took over as Director RRCAT since 01 July 2024 from Dr. Shankar V. Nakhe.