Prior to founding Thea, Efim worked at IBM, Motorola, and Magic Solutions as Head of Search Technology where he developed search engine and early Artificial Intelligence systems which were licensed to Microsoft, AT&T, Ziff Davis, and Intel.
Efim later co-founded Trafficmedia an early pioneer of domain parking platforms and Cybertavern the first major investor in Quigo later acquired by AOL.
Efim holds a M.Sc. in Applied Mathematics from the Weitzman Institute of Science and a B.Sc. from the Technion – Israel Institute of Technology