Humboldt-Universität zu Berlin | Wirtschaftswissenschaftliche Fakultät | High Dimensional Nonstationary Time Series | About us | News Feed | News 2021 | Dissertation: Georg Keilbar completes PhD Dissertation: Georg Keilbar completes PhD 20.08.2021 20.08.2021. Georg Keilbar defended his PhD dissertation on "Essays on Modern Econometrics and Machine Learning". Congratulations!