Born on 19.01.1882 in Samokov, died on 03.01.1971 in Sofia. In 1901 completed the general course of the School of Arts in Sofia, the class of Petko Klisurov and Ivan Angelov. Within the period 1901–1906 he specialized mural painting and theatre decoration in Munich. Milenkov is the first Bulgarian professional theatre artist, and an author of the stage design of more than 370 dramas, operas, operettas. He regularly participated in general art exhibitions and organized five individual exhibitions. He has been chairing of the Union of Bulgarian Artists.
Alexander Milenkov visited Macedonia at least two times: the first time in 1916 and the second time around 1940. Testament of his Macedonia visits are the paintings “Ohrid 1916” and “Skopje 1940” which were sold by the auction house Victoria, Sophia, Bulgaria on 12th May 2005 (lot number:13 and 14).as well s the watercolor “Ohrid Lake” sold by the same auction house on 10.12.2009 ( lot number 31).