Rajsekhar grew up in West Bengal, India. He obtained his Bachelors degree in Physics from Midanpore college and then moved to Chennai for his Masters in Physics from IIT Madras. After completing his PhD from TIFR-Hyderabad under the supervision of Prof. Smarajit Karmakar he joined Prof. Thirumalai's group.

He is interested in studying the role of various length scales on the dynamics of glass-forming liquids. His work also involves understanding the dynamic heterogeneity and relaxation processes in supercooled liquids. Currently, he is working on the effect of random pinning in Wigner glasses.