Humboldt-Universität zu Berlin | Wirtschaftswissenschaftliche Fakultät | High Dimensional Nonstationary Time Series | About us | News Feed | News 2017 | Dissertation: S. Nasekin completes PhD Dissertation: S. Nasekin completes PhD 20.01.2017. Sergey Nasekin, IRTG PhD student, defended his PhD dissertation on "Dynamic Dimension Reduction for Financial Applications" with Summa Cum Laude. Congratulations!