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I am a theoretical physicist and professor of Mathematical Radiation Physics at ̽����ѡ in Stockholm, Sweden. My current research activities are in atomic collision physics, radiation physics, radiobiology, magnetic resonance physics and mathematical physics. In atomic heavy-particle collision physics, my past and current work encompasses many problems reflecting major challenges in this research field, such as theory of charge exchange and ionization at high non-relativistic energies.

I have published more than 200 scientific works, which have received over 3000 citations. My six books “Principles of Quantum Scattering Theory”, “Quantum Mechanical Signal Processing and Spectral Analysis” “Quantum Theory of High-Energy Ion-Atom Collisions” and “Signal Processing in Magnetic Resonance Spectroscopy with Bio̽����ѡ Applications”, “Fast Ion-Atom and Ion-Molecule Collisions” and Magnetic Resonance Imaging and Spectroscopy Vol. 3 of the Comprehensive Bio̽����ѡ Physics were published by the Institute of Physics Publishing, Taylor & Francis, World Scientific and Elsevier in 2003, 2004, 2008, 2010, 2012 and 2014 respectively. Among these have been the top-selling physics books. I have received numerous international awards for my scientific research, including the triple guest professorship in Atomic Physics from the Nobel Foundation and the Royal Swedish Academy of Sciences.

I am one of the world’s leading experts on the Coulomb asymptotic convergence problem, distorted wave representations and perturbation expansions methods. I am known for furthering the powerful and versatile continuum distorted wave method and its derivatives that were advantageously exported to ion-atom and photon-atom collisions and also found their useful applications in ̽����ѡ physics. In radiation physics, I work on the passage of fast electrons and multiply-charged ions through tissue, as needed in radiation therapy in medicine. Here I further both deterministic methods through the Boltzmann equation and stochastic simulations via Monte Carlo computations. In radiobiology, my research entails mathematical modeling for cell survival, with the main emphasis on mechanistic approaches by including the chief pathways for survival of cells under irradiation during radiotherapy.

In magnetic resonance physics, I work on magnetic resonance spectroscopy with the main applications to ̽����ѡ diagnostics, aided critically by high-resolution parametric signal processors that go beyond the conventional shape estimations of spectra and fitting approaches to quantification. The leading processor here is his fast Padé transform for exact spectral analysis of generic time signals and unequivocal signal-noise separation via Froissart doublets or pole-zero cancellations in response functions. In mathematical physics, he works on many problems including the derivation of analytical expressions for scattering integrals or bound-free form factors, for rational response functions in signal processing, and for coupling parameters in the nearest neighbour approximation, which is one of the most frequently used methods in physics and chemistry.