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1970
graduated from the faculty of Economics of the Yerevan State University with honour, thereafter was a post-graduate student in the Yerevan State University.
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1973
was a lecturer in the Yerevan State University, then was the chief lecturer, Docent in the Institute of National Economics.
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1977-1978
conducted scientific research at the Belgrade University (Yugoslavia)
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1982-1987
was an economist-lecturer in the Central Committee of Communist Party of the Armenian Republic.
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1987
was appointed as a head of the Social-Economic Department of the Central Committee.
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1990
was elected as a Deputy of Supreme Council of the Republic of Armenia, in the same year was elected as a Vice-Chairman of the Supreme Council of the Republic of Armenia.
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1991
was elected as a Vice-President of the Republic of Armenia.
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From November 1991 to July 1992
has carried out duties of Prime-Minister of the Republic of Armenia.
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On February 6, 1996
was nominated as the President of the Constitutional Court of the Republic of Armenia.
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1996-2009
President of the Center of Constitutional Law of the Republic of Armenia.
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In December 1997
was elected as a Member of International Academy of Information.
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Since 1997
has been a member of the European Commission for Democracy through Law of the Council of Europe (Venice Commission).
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Since November 1998
мember of International Association of Constitutional Law.
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2014-2017
member of the Bureau of the Venice Commission.
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Since 2009
member of the Bureau of the World Conference on Constitutional Justice.
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2014-2015
Chairman of the Bureau of the World Conference on Constitutional Justice.
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On 23 April, 1998
According to the Decree of the President of the Republic of Armenia Gagik Harutyunyan was awarded The High Judicial Qualification of a Judge.
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In March 1999
defended the dissertation on "Constitutional Court in the state power system" (comparative analysis). G. Harutyunyan is a Doctor of Law, Professor.