[1] He attended the Gheorghe Roșca Codreanu High School in Bârlad from 1901 to 1908, continuing his studies at the Faculty of Sciences of the University of Iași from 1908 to 1912.

[2] In 1919 he obtained a scholarship to continue his studies at the University of Paris, attending courses of famous scientists, such as Gabriel Lippmann, Marie Curie, Paul Langevin, and Aimé Cotton.

On 5 March 1924, Procopiu obtained the title of doctor in physics with the thesis "On the electric birefringence of suspensions" presented to a commission including professor Aimé Cotton as coordinator and Charles Fabry and Henri Mouton as cross-examiners.

[4] At the same time he was appointed professor at the Gheorghe Asachi Polytechnic Institute of Iași[3] In 1939 Ștefan Procopiu published his treatise on "Electricity and Magnetism", followed in 1948 by his monography on “Thermodynamics”.

The first important paper by Ștefan Procopiu is "Determining the Molecular Magnetic Moment by M. Planck’s Quantum Theory".

[6] Ștefan Procopiu published his results two years before Niels Bohr made the same discovery independently.

[7] In 1921, Procopiu discovered and analyzed in the Physics Laboratory of Sorbonne University a new optical phenomenon which consisted in the longitudinal depolarization of light by suspensions and colloids.