IN 2018, THE SERBIAN ACADEMY OF Sciences and Arts (SASA) and mathematicians in Serbia celebrate the 150th anniversary of the birth of academician Mihailo Petrović Alas, a great Serbian mathematician and one of the founders of the Serbian mathematical school. The academician Petrović was a distinguished professor of mathematics at the University of Belgrade, but also a fisherman, writer, philosopher, musician, world traveler and travel writer. He earned his doctoral degree at the Sorbonne in 1894, where his professors were illustrious French mathematicians Henri Poincaré, Charles Hermite and Charles Émile Picard. The same year, he returned to Belgrade, where he became professor at the Belgrade’s Grande école (Grand School – Velika škola), to which he brought the spirit of the French mathematical school. With Petrović’s return, Belgrade achieved parity with other major European centers in mathematical sciences. Petrovic achieved scientific results of world-class relevance in fields of differential equations, complex and numerical analysis, geometry of polynomials and mathematical phenomenology. He also invented several analog computing machines and was the main cryptographer of Serbian and Yugoslav Army. One of professor Petrović’s greatest and most important achievements was establishment of the Serbian mathematical school, which has produced a great number of renowned and successful mathematicians not only in Serbia but also around the world, who have continued Petrović’s mathematical work. Until the Second World War, all doctoral dissertations in mathematics defended at the University of Belgrade had been done with his mentorship. The exhibition entitled “Mihailo Petrović Alas” is dedicated to academician Petrović and is a part of marking this important anniversary in the history of Serbian mathematics and science in Serbia.