Aleksandar Kojić was born in Novi Sad in 1984. He completed his undergraduate studies in Conducting under the tutelage of Bojan Suđić at the Faculty of Music Arts in Belgrade (Serbia) in 2008. He continued his education in Vienna (Austria), at the Universität für Musik und Darstellende Kunst with Mark Stringer, Daniel Harding, and Vladimir Kiradiev.
At the outset of his studies, he was engaged as the accompanist for the AKUD Branko Krsmanović Choir, and afterwards served as accompanist of the Serbian National Radio and Television Choir, where his work included projects such as Great Mass in C minor by W. A. Mozart and Messiah by G. F. Händel. He has also performed as a member of Serbian National Radio and Television Symphony Orchestra. In 2005, he took part in the conducting master class focusing on Beethoven's symphonies led by Uroš Lajovic. As a member of St. Stefan Dečanski Choir, he attended workshops led by Georg Grünn, Frieder Bernius, and Erwin Ortner held during the European Choir Festival Europa Cantat in Mainz, Germany (2006). In Vienna from 2007 through 2008, he conducted the Czech Virtuosi Orchestra from Brno, performing numerous symphonic and operatic pieces (Mozart, Tchaikowsky, Britten, Wagner, Stravinsky, Saint-Saëns, Bartok, Dvořák, Shostakovich, Sibelius).
From 2007 until 2009, he was employed at Isidor Bajić Music School, where he occupied the position of High School Symphony Orchestra Conductor. Since 2009, he has been engaged at the Serbian National Theater, first as the Assistant Conductor (2009), then as the Opera Conductor (2010). As a collaborative pianist he frequently engages with singers in Novi Sad, Belgrade, and Vienna. Of note among the many significant projects with which he has been involved are the recording of the children's ballet The Widow's Broom by Aleksandra Vrebalov (2009) and the world premier of Vrebalov's opera Mileva (2011). In 2009, he also conducted the world premier of Dance of Wooden Sticks, a composition for horn and string orchestra by Isidora Žebeljan, performed by the Camerata Academica chamber orchestra from Novi Sad. His repertoire as the Serbian National Theater Opera Conductor includes La Traviata, Trubadur (Verdi), Le Convenienze de Inconvenienze Teatrali (Conventions and Inconveniences of the Stage), also known as Viva la Mamma (Donizetti), La Bohème (Puccini), The Queen of Spades (Tschaikowsky), Mileva (Vrebalov), and Don Giovanni (Mozart).