Basic works are devoted to the ancient and medieval history of Armenia, historical Geography of Armenia, chronological problems of Armenian history, Cartography of Armenian history, separate problems of modern and contemporary history

Graduated from YSU, faculty of History (1962) and Jurisprudence (1977). Dr. of Historical Sciences (1944), prof. (2005), corr. member (2006)

Academician Secretary of NAS RA (since 2007)

Full member of International Academy of Sciences of Nature and Sosiety (1999), "Ararat" (2001, France) and "Eurpaeische Academie der Naturwissenschaften" (2006, Hannover) academies

Honored with "Golden medal" of YSU (1999), medal of "Movses Khorenatsi" (2006) and "Albert Shweitzer-Medaille", orders of "Catherine the Great" and "Golden Eagle with crown"

Lecturer of YSU (1967-69), Senior lecturer (1969-72), Associate professor (1972-94), prof. (since 1994), Din of the Faculty of History (1993-2004) and Din-coordinator of the foreign students of YSU (1970-71), Director of the publishing house "Yerevani hamalsaran" (1985-88), Scientific chief of the "Laboratory of Historical Geography and Cartography of Armenia" of YSU (from 1988 till now), Head of the chair of History of Armenia's contiguous countries of YSU (1997-2000) and Head of the chair of History of Armenia (2003-2007).