Ireneusz Stefaniuk, Polish physics professor, physicist. Achievements include discovery of phase transition of secondary order of NaNH4SO42H2O crystal at 200K. Grantee, State Committee Science Research, 2004-2006. Member of Polish Physics Society, Polish Electron Paramagnetic Resonance Society, International Electron Spin Resonance Society.
- Assistant professor Rzeszów University, 1986—1997, adjunct professor, since 1997. Senior lecturer Higher Vocational State School, Sanok, since 2003. Member Polish Committee for Standardization, Warsaw, since 2005.