Efi is a research scientist at Google since February 2013. She joined Google as a PostDoc researcher in September 2011. Before that she was a postdoctoral research fellow at the Seminar for Applied Mathematics (SAM) at ETH, Zurich. She completed her PhD studies in December 2008 at the Signal Processing Laboratory (LTS4) of the Swiss Federal Institute of Technology (EPFL), Lausanne under the supervision of Prof. Pascal Frossard. Before that she was with the Computer Science & Engineering Department of the University of Minnesota, USA, where she obtained in June 2005 her M.Sc. degree under the supervision of Prof. Yousef Saad. She obtained B.Eng. and MscEng. degrees in 2002 and 2003 respectively at the Computer Engineering and Informatics Department of the University of Patras, Greece.