In 2001, he moved to Eindhoven University of Technology, the Netherlands for his doctoral studies under the guidance of Frans J.J. van Loo and A.
He did his post-doctoral work at University of British Columbia, Vancouver, Canada at their Advanced Materials and Process Engineering Laboratory (AMPEL) during 2004–05 and returned to India in 2005 to take up the position of an assistant professor at his alma mater, Indian Institute of Science.
[4][5] While at Eindhoven University of Technology, he was among the group of scientists who made pathbreaking discovery showing previously unknown phenomena related to the Kirkendall effect leading to finer understanding based on new models, which are included in the textbooks.
[5] After joining the Department of Materials Engineering, Indian Institute of Science, his group established the mathematical formalism for physico-chemical approach that quantitatively relates diffusion rates of components with microstructural evolution, an important aspect to understand many physical and mechanical properties of materials.
[6] Prof. Paul's group is currently working on developing new quantitative models which facilitates the estimation of meaningful composition dependent diffusion coefficients in multicomponent systems by tailoring the experiments to counter the complications of mathematical formalism developed based on formalism proposed by Lars Onsager.