Jacob Schaf has obtained his Doctor in Physical Sciences 1979, from the Federal University of Rio Grande do Sul (UFRGS) Brazil, with an experimental thesis work on Hyperfine Interactions, using Gamma Angular Correlations and Mossbauer Effect.

In a subsequent two years Post-Doctor stage he developed experimental physics at the Université de Paris Sud, Centre de Orsay-France, using Spin-Echo NMR, Magnetic Measurements and Magnetoresistance in magnetic metallic alloys.

Back to Brazil, he lectured most disciplines of the graduate physics course as well as some post-graduate courses in the Institute of Physics of the UFRGS. Besides this, he developed experimental research on magnetic materials and superconductivity, advising several doctor theses.  

Now retired and with nearly 150 authored research articles, published in the most reputed Journals, dedicates full time to his favorite physics topics, the problems of gravitation and cosmology, achieving now a dozen of publications.