When the University of Belgrade was founded in 1905, he was among the first eight full-time professors who selected the entire remaining academic staff. Sima Lozanić was then chosen as the first rector of the university. His 1905 opening ceremony words remained recorded as the following: His chemistry classes paralleled, perhaps exceeded in some cases, those of the top European universities. They were organized with well-equipped laboratories and libraries, and produced some of the first chemistry textbooks. Lozanić himself wrote a number of textbooks, which covered various subject areas of chemistry: Inorganic chemistry, Organic chemistry, Analytical chemistry and Chemical technology. His textbooks were internationally renowned and in some areas groundbreaking. For example, Lozanić's Inorganic Chemistry textbook was the first European university textbook with Dmitriy Mendeleyev's periodic table of elements and one of the first containing a chapter on Thermochemistry. His Organic Chemistry textbooks are among the first books in which the compounds were represented by structural formulas. He also did scientific and professional work related to all areas of Chemistry; some of his most valued works were about electrosynthesis in which he researched the reactions of CO and CO2 with other substances under the effect of electric discharge. He published over 200 scientific papers in applied and experimental chemistry. Lozanić performed the first analysis of thermal water of Gamzigradspa in 1889. He became a member of the Serbian Learned Society on January 30, 1873, associate member of Serbian Royal Academy on January 23, 1888 and became a full member on January 6, 1890. He was a president of Serbian Royal Academy twice - 1899 to 1900 and 1903 to 1906. From 1907 to 1912 he was a president of Serbian Chemistry Society. He was the minister of industry from January 12, 1894 to March 21, 1894, and October 15, 1894 to June 25, 1895 and October 11, 1897 to June 30, 1899, minister of foreign affairs from March 21, 1894 to October 15, 1894 and from December 23, 1902 to March 23, 1903, as well as a diplomat and participant in all wars of the time. Lozanić was the ambassador of the Serbian government in London from 1900. He was a president of Serbian refugee aid committee in 1916 and a head of US mission for aid and support of Serbia from 1917. He was the first honorary doctor of sciences of the University of Belgrade. He died July 7, 1935 in Belgrade, in the age of 89. His son Milivoje S. Lozanić was also a chemist and inherited his university position as the professor of Chemistry. Sima's two daughters, Ana Lozanić Marinković became a well-known painter and Jelena Lozanić who, like her father, affirmed in humanitarian work and in the battle for women's rights, participated in international congresses in the United States in 1915 as a Serbian Red Cross delegate to enlist aid for her war desolated country. Since the war continued in Serbia, she stayed in America until the year 1920, when she married John Frothingham, the great benefactor to Serbian people. Together with Michael Pupin, Mr. and Mrs. John Frothingham contributed greatly in delivering humanitarian aid.
