Profile I am an interdisciplinary complex systems theorist specialising in quantitative problem solving in physics, biology and finance using techniques from statistical physics, nonlinear dynamics, including field theory and numerical computation.
In physics, my core interests are in statistical physics, dynamics of fluid flows including granular mechanics, critical phenomena and polymers. It was on these topics that I did a PhD way back in 2001 ('Turbulence in Low Dimensional Models'). My other areas of interest in traditional physics are in many body theories, focusing on coupled quantum systems (e.g. quantum dots) and aggravated flows around accretion discs.
Presently, though, I am more enamoured with stochastic disordered systems as evident in biology and finance:

In biology, my core interest areas are four fold  T/B cell immunology, atherosclerosis provoked cardiovascular deaths (CVD), molecular motor driven cellular dynamics and population biology. Two PhD students are currently engaged in researches on the first two topics with more to join soon. On all four research areas I have vibrant international collaborations with European and transnational colleagues.
In mathematical finance, my choice areas are poverty economics, macroeconomics of capital flow and optimisation kinetics in supply chain management modelling. The former topic is presently funded by Royal Society, UK with an active network involving economists, business management specialists and computational experts linking up the others in a nationwide chain of topical research.
I have so far authored or coauthored over 35 research publications and 2 books. One of these books ('Heat and Thermodynamics') is the internationally accepted standard text or reference book on the subject.
I referee more than 5 principal journals in physics and interdisciplinary science and am the chief editor of an open sourced interdisciplinary journal. I am also a panelled reviewer of EPSRC.
My research background
After obtaining a Ph. D. in statistical physics and fluid mechanics in 2001 from the Indian Association for the Cultivation of Science (registered: Jadavpur University), India, I began my postdoctoral journey at the Max Planck Institute for the Physics of Complex Systems in Dresden, Germany. I was at the MPIPKS for around two and a half years working on chosen problems in mathematical biology (molecular motors), fluid mechanics (turbulence) and condensed matter physics (superconductivity). Thereafter, supported by an Alexander von Humboldt fellowship, I moved over to the HahnMeitner Institute in Berlin to work in nonequilibrium statistical physics (field theoretic applications in classical critical phenomena). This position was followed by a research associateship at the Mathematics Institute, University of Warwick to mathematical model the dynamics of the T cell immunological synapse. The UK sojourn led to a Marie Curie Incoming International Fellowship to work on multiple aspects of statistical (strong coupling KPZ model) and biological physics (molecular motors, population biology) at the University of Padua, Italy. After a brief stay at the University of Edinburgh, I eventually took up a readership at the University of Delhi, India in 2007 where I moved on to a (permanent) Associate Readership. Starting February 2010, I am at Aston, in the interdisciplinary complex systems unit as a lecturer in mathematics.
My research spans a wide range of interdisciplinary topics involving mathematical biology, epidemiology, medical imaging, gene sequencing, statistical mechanics with its varied applications and fluid mechanics, including the turbulence associated with accretion discs.
Positions  Lecturer in the Mathematics of Complex Systems at Aston University, UK: February 2010 to present
 Associate Professor in Physics at the University of Delhi, India: January 2009 to January 2010
 Reader in Physics at the University of Delhi, India: September 2007 to January 2009
Teaching
Presently teaching two undergraduate modules:
 Vector Algebra & Geometry and
 Financial Mathematics
and a postgraduate (MSc by Research) module:
 Stochastic and Nonlinear Dynamical Systems
Administration
I am the Programme Director of the MSc by Research in the Mathematics of Complex Systems at Aston University.
Research
 Mathematical Biology
 Immunology  T/B cell immunological synapse & related pathways
 Cell biology (molecular motors)  Fertilisation & muscle action
 Atherosclerosis & CVD  Dynamics of Ageing
 Population biology  Diurnal variation of the Gastrointestinal parasitic (GIP) infection
 Medical Imaging  Lung segmentation problem
 Neuroscience  Delay mechanism in axon firing
 Bioinformatics & Epidemiology
 Gene sequencing problem  Classification of similar sequences based on a new algorithm
 Biophotonics (fibre laser)  'Order parameter' based phase transition prediction from BIG data.
 EPG Epidemiology: Modelling of gastrointestinal bacterial dynamics
 Medical imaging  Content based image retrieval, face recognition technology
 Financial Mathematics
 Developmental economics  Time evolution of the poverty/inequality index
 Macroeconomics  Effects of stochasticity in Capital Asset flow
 Supply chain management  Input/output optimisation based on industrial constraints
 Fluid Mechanics
 Turbulence  NonNewtonian flow and intermittency exponent
 Astrophysics  Accretion flows
 Statistical Physics
 Polymers  Depolymerisation mechanism of actin & kinesin
 Spin systems Thermal fluctuations in nonequilibrium interconnected heat baths
PhD supervision Presently supervising two PhD students:
 mathematical modelling of T/B cell immunology: Daniel J Bush (in his third year now)
 mathematical modelling of atherosclerosis: Xi He (in her second year now)
Books  Heat and Thermodynamics by Dittman, R. H., Zemansky, M. W. and Chattopadhyay A. K. (adapted) by Tata McGrawHill (April, 2011).
 3000 Solved Problems in Physics by Halpern, A. Edited by Chattopadhyay, A. K. Published by McGrawHill (2010).