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Hyperallergic was founded by Vartanian and his husband Veken Gueyikian in October 2009 as a "forum for serious, playful and radical thinking".
Vartanian has contributed to numerous online and print publications including the Art:21 blog, Boldtype, The Brooklyn Rail, Huffington Post, AGBU News Magazine, Ararat Magazine, and NYFA Current. He has guest contributed to Al Jazeera, NPR, ABC, and WNYC.
He was formerly Director of Communications at AGBU, the world's largest Armenian non-profit organization. Vartanian was a staunch supporter of the controversial Hide/Seek exhibit which was censored by the Smithsonian.
- "Do Bush’s Paintings Tell Us Anything About the Former President?" (February 2013) 
- "An Experiment in Street Art Criticism" (March 2010) 
- “Is Contemporary Architecture a PR Panacea for Autocrats? Western Architectural Ethics & Undemocratic Nations“ in Brooklyn Rail (September 2008)
- “The Very Public Life of Street Art” in Brooklyn Rail (May 2008)
- "Peter Sourian" from "Forgotten Bread: First Generation Armenian-American Writers" edited by David Kherdian (Berkeley, CA: Heyday books, 2007) 
- "An Imaginary Armenian Canadian Homeland: Gariné Torossian’s Dialogue with Egoyan" from Image and Territory: Essays on Atom Egoyan edited by Monique Tschofen and Jennifer Burwell (Waterloo, ON: Wildred Laurier University Press, 2006).
- Bushwick Open Studios featuring artists: Andrew Ohanesian, Tescia Seufferlein, Andrew Cornell Robinson, Richard Martinez.
- "Schwierige Wahrheiten: Die Schriftstellerin Nancy Kricorian (The Will to Resist: A Portrait of Nancy Kricorian)," in Porträt einer Hoffnung Die Armenier edited by Huberta von Voss (Verlag Hans Schiller, 2004). English edition 
- "New York Life Recognizes Genocide Era Insurance Claims," AGBU Magazine (April 2004).
- "Nazi Style Wars," The Brooklyn Rail (October 2003).
- "Curating on the Margins," The Brooklyn Rail (Winter 2003).
- "Artist Biographies," The Clement Greenberg Collection (Princeton, NJ: Princeton University, 2001).
- FutureHype/Kitabet, edited by Carmen Donabedian & Hrag Vartanian (Beirut: Haigazian University, 1998).
- "Chine Drive: An Arts & Crafts Community," in The Stuff Dreams are Made of: The Art and Design of Frederick and Louise Coates (Toronto: University of Toronto, 1997).
- Meehan, Emily (24 January 2007). "Never Mind the Bullets". The Wall Street Journal.
- Aaron Short (24 January 2011). "Art of the steal! Thief swipes a Ridley Howard drawing off gallery wall". Brooklyn Paper. Retrieved 27 January 2011.
- Lean, edited by Huberta von Voss ; translated by Alasdair (2007). Portraits of hope : Armenians in the contemporary world (1st English ed. ed.). New York: Berghahn Books. p. 339. ISBN 978-1-84545-257-5. Retrieved 27 January 2011.
- “About Hyperallergic“, Hyperallergic.com 24 April 2011.
- Vartanian, Hrag. "Hrag Vartanian". Huffington Post.
- "Hide/Seek Press", www.hideseek.org. Retrieved 9 March 2010.