CONFERENCES 2019 "Operator Theory and Krein Spaces", Vienna, Austria, December 19-22 2019 "Spectral Theory and Differential Equations" Sveti Martin na Muri, Croatia, September 8-13 2019 "AMS Spring Eastern Sectional Meeting" University of Connecticut, Hartford, CT, USA, April 13-14 2018 "Modeling, Analysis, and Approximation Theory" Humboldt University, Berlin, Germany, August 19-20 2018 "Advances in Operator Theory with Applications to Mathematical Physics" Chapman University, Orange, CA, USA, November 12-16 2017 "Stefan Banach Conference in Functional Analysis" Lviv, Ukraine, September, 18 - 23 2017 Summer School, "Modeling, Analysis, and Approximation Theory" L¨ubeck, Germany, July 31 { August 4 2015 All-Ukrainian conference "Modern problems of probability theory and mathematical analysis", Vorokhta, Ukraine, February 25-28 2015 Workshop "Spectral Theory and Weyl Function" Oberwolfach, Germany, January, 4 - 10 2014 "Operator Theory, Analysis and Mathematical Physics" Stockholm, Sweden, July 7 - 11 2013 Workshop "System and Operator Realizations of Analytic Functions" Leiden, The Netherlands, February, 17-24 2010 IWOTA, 21-th International Workshop on Operator Theory and its Applications Berlin, Germany, July 12 { 16 2009 Workshop "Boundary Relations, extension theory and applications" Leiden, The Netherlands, December 13-18 2009 Ukrainian Mathematical Congress, Kiev, Ukraine, August 27-29 2009 Haifa Matrix Theory Conference, Haifa, Israel, May 18 - 21 2008 8-th Workshop "Operator Theory in Krein Spaces and Spectral Analysis", Berlin, Germany, December 18-21 2007 International Conference Modern Analysis and Its Applications dedicated to the centenary of Mark Krein, Odessa, Ukraine, April 9-14 2007 7-th Workshop "Operator Theory in Krein Spaces and Spectral Analysis", Berlin, Germany, December 13-16 2004 IWOTA, International Workshop on Operator Theory and its Applications Newcastle, England, July 12 { 17 2004 3-rd Workshop on Operator Theory and Nonlinear Eigenvalue Problems Berlin, Germany, December 12 { 14; 2001 International Conference on Functional Analysis Kiev, Ukraine, August 22-26; 2000 IWOTA, International Workshop on Operator Theory and its Applications Bordeaux, France, June 13-16; 2000 Sofia Kovalevskaya International Conference Stockholm, Sweden, June 20-24; 9 Ph.D STUDENTS 2018 O. Sukhorukova, Vasyl Stus Donetsk National University, Vinnitsya, Ukraine 2018 I. Kovalyov, Vasyl Stus Donetsk National University, Vinnitsya, Ukraine 2017 E. Neiman, Vasyl Stus Donetsk National University, Vinnitsya, Ukraine 2008 K. Simonov, Donetsk National University, Donetsk, Ukraine 2007 M. Derevyagin, Donetsk National University, Donetsk, Ukraine 2006 A. Amirshadyan, Donetsk National University, Donetsk, Ukraine 10.