He is quite famous in Saint Petersburg, you can follow his photography on Facebook as well. Although overtime, I find his work a bit "angry" and at times, quite intrusive into the privacy of his subjects. He is also famous for his "postcard"-looking shots of the city of Saint Petersburg (lots of calendars published every year with his work). He does quite a bit of masterclasses as well.
http://designyoutrust.com/2017/03/the-russia-youll-never-see-on-postcards-through-the-lens-of-photographer-alexander-petrosyan/