Janez Stepišnik was born on April 6, 1940 in Ljubljana. He started his carrier in year 1963 as an engineer of physics at the research-development labs of the electro-company Iskra in Slovenia. Later in 1966, he got a job as a young scientist at the Jožef Stefan Institute and continued PhD studies at the Department of Physics of the University of Ljubljana. In 1971, he received PhD  with a thesis on the study of ferroelectrics by NMR methods. In 1971 he became an assistant professor of physics and later in 1975 a professor of experimental and modern physics at the University of Ljubljana. During his postdoc at the University of Washington in Seattle in 1973-74, he studied diffusion in super-ion conductors. In 1994-1995, he was a visiting professor at Massey University in New Zealand, where he developed a new  NMR method, named the modulated gradient spin echo. In years 2002-04, during his sabbatical,  he lectured at Wageningen Universitythe Netherland, at RWTH, Aachen, Germany, at the Massachusetts Institute of Technology, USA, at the University of California, Berkeley, USA, at New Mexico Resonance Labs, Albuquerque, USA, at Harvard Medical School, USA, at the Institute of Polymers, Dresden, Germany and at the Montana State University, Bozeman, USA.

In the years 1984–1986, Janez Stepišnik headed the Association for Mathematics, Physics and Astronomy of Slovenia. He was the head of the Department of Physics at the University of Ljubljana in years 1987–89. He organized the 14th European Experimental NMR Conference in Bled, 1998, and was chairman of the International Committee of European Experimental NMR Conferences from 2000 to 2005. Since 2003 he has been a member of the Scientific Committee and a lecturer at the international AMPERE NMR Summer School in Poland.

In 1977, he received the National Science Foundation Award for Achievement in Measuring Molecular Movements with NMR and the same foundation award for the patent in the field of ultrasound in 1985.


In 1976, during his postdoc at the University of Washington, he found a link between the attenuation of spin echo in an inhomogeneous magnetic field and a spectrum of molecular translation velocity autocorrelations that predicts possibility of direct measurements of molecular dynamics by NMR methods. This idea was realized in 1995 in the laboratories of Paul.T. Callaghan in New Zealand, with the development of the method "NMR modulated gradient spin echo".
In 1981, he introduced an ultrasonic method for measuring the degree of hydration of cement paste using the reflection of shear waves, which became the standard test method in the cement and construction industries.

In 1986, he demonstrated the possibility of using a weak geomagnetic field for magnetic resonance imaging to lower the cost of MR imaging devices.

In 2005, they increased the frequency range of the NMR-modulated spin echo gradient method above 10 kHz, which made it possible to study translational diffusion in excited granular systems, limited diffusion in nano-pore systems, and molecular dynamics in liquids and polymers..


His bibliography includes more than 250 publications in international scientific journals, books and proceedings of international conferences with about 2000 citations, where the most frequently mentioned are:

·       "Analysis of NMR self-diffusion measurements by a density matrix calculation" in Physica B+C, 1981,

·       "The cement hydration measured by ultrasonic" in Ceramic Bulletin, 1981

·       "Spatially-Distributed Pulsed Gradient Spin Echo NMR using Single-Wire Proximity " in Physical Review Letters, 1995,

·       "Generalized Analysis of Motion Using Magnetic Field Gradients" in the book series Advances in Magnetic and Optical Resonance, vol. 19, Academic Press 1996,

·       "Autocorrelation spectra of an air-fluidized granular system measured by NMR" in Europhysics Letters, 2006,

·       "NMR down to Earth" in Nature, 2006,

·       "NMR in the Earth's magnetic field " in Progress in NMR Spectroscopy, Pergamon Press 2009,

·       "Self-diffusion in nanopores studied by the NMR pulse gradient spin echo" in EuroPhysics Letters, 2012,

·       "Velocity autocorrelation spectra in molten polymer measured by NMR modulated gradient spin-echo", in EuroPhysics Letters, 2014,

·        "Usage of internal magnetic fields to study the early hydration process of cement paste by MGSE method", in Journal of Magnetic Resonance, 2016,

·       “Molecular velocity auto-correlations in glycerol/water mixtures studied by NMR MGSE method”, in Physica A: Statistical Mechanics and its Applications, 2020.