Milen attended the Saint Petersburg Conservatory in Russia. There, he received his Master’s Degree in Symphonic and Opera conducting. Nachev was Artistic Director & Conductor of the Bulgarian National Radio Symphony Orchestra (BNR) from 1994 until 2002, where he conducted recordings that were broadcast by the BBC. In November 1997, EMI/Virgin released the CD 'Mozart in Egypt', which was conducted by Nachev while with the BNR Symphony Orchestra. Since 2012, Mr. Nachev has been a conductor with Shen Yun Performing Arts—an international touring company based in New York.