Russian leading case study developer organizing worlds largest independent case championship Changellenge >> Cup Russia, writing various cases and providing marketing and recruiting services to companies with need for high-potential employees: Accenture, A.T. Kearney, BCG, EY, Gazpromneft, KPMG, Mars, PwC, Lukoil Overseas, Sanofi, Sberbank, Strategy Partners Group, Unilever and other.