this is my fourth year in boston as a phd student in the computer science department at boston university, working with the database group and professor george kollios. i am from athens, greece, where in 2005 i completed my undergraduate studies in electrical and computer engineering at the national technical university of athens. towards my phd, i spent a great summer at yahoo! research barcelona in 2008. i also serve as the cs department representative for the graduate student organization. last, here is a link to our algorithmic-aspects-of-social-networks reading group.