Since October 2015—Head of the Mathematics Department of Ariel University, Ariel, Israel, 2008–2015—Dean of the Natural Sciences Faculty, Ariel University, Ariel, Israel, 2003–2008—Head of the Department of Mathematics and Computer Sciences, Ariel University Center of Samaria, Ariel, Israel, 1998–2003—Camea scientist and senior lecturer, The Academic College of Judea and Samaria, Ariel, 1995–1998—Giladi scientist and coordinator of courses for gifted children, Department of Youth Activities, Technion, Haifa, Israel, 1993–1995—Scientist New Immigrant and coordinator of courses for gifted children, Department of Youth Activities, Technion, Haifa, Israel, 1991–1993—Researcher, Department of Mathematics, Technion, Haifa, Israel, 1984–1990—Senior lecturer and lecturer at the Department of Mathematics, Perm State Technical University, Perm, USSR, 1979–1984—Assistant and PhD student, Perm State Technical University, Perm, USSR.