In 2004, he presented the first Armenian performance of Hovhaness's piano concerto "Lousadzak" (1944), with the Alan Hovhaness Chamber Orchestra of Yerevan. With pianist Atakan Sarı, he gave the world premiere performance in Moscow of Hovhaness' 1954 Concerto for Two Pianos and Orchestra with the Globalis Symphony Orchestra. In 2005, he presented the Turkish premiere of "Lousadzak" with the Orchestra Academic Başkent, Ankara, perhaps the first performance of a Hovhaness work in that nation. That same year, his and Atakan Sari's recording of Hovhaness' Concerto for Two Pianos and Orchestra was released. In November 2006, again with Sarı, he gave the Armenian premiere of the Hovhaness Concerto for Two Pianos and Orchestra, with the Armenian Philharmonic Orchestra in Yerevan. Another Hovhaness Armenian premiere was given in April 2008, with the Armenian Philharmonic Orchestra in Yerevan, this time, Hovhaness' early "Prayer-Piano Concerto for Symphony Orchestra." At the same time, Berkofsky was awarded a Diploma by the Ministry of Culture of Armenia for his services to Armenian music. For a number of years he was one of the coordinators of a project to establish a central archive of Hovhaness' work in Yerevan, Armenia.