Born in 1971, graduate of the Moscow State University of Graphic Arts, was working as the deputy director of the Mediacentre-ART Publishers. Margolin is married, with two daughters. Under arrest (as of October 2013).

Margolin was arrested on February 21, 2013. He was accused of violating paragraph 1 of article 318 of the Russian Criminal Code and paragraph 2 of article 212 of the Russian Criminal Code. He had been taking part in the protest events in Russia starting from December 2011 (when he was arrested after the rally at Chistiye Prudy (Dec 5) and sentenced to 10 days in detention). He was not detained after the notorious May 6 rally in the Bolotnaya Square, but was arrested later. The investigators claim to hold video records which show Margolin trying to knock down a police task force officer. That said, no video records confirming this have been provided.