personal homepage

**organizing:**BIRS Workshop "Differential-algebraic equations and Operator Pencils" (co-organizers: M. Embree, K. Morris, T. Reis), Banff (CAN), Apr- Elgersburg/Ilmenau Workshop 2023, Ilmenau, Mar, invited plenary talk

- Colloquium Talk at University of Paderborn, Dec
- MTNS 2022, Bayreuth, Sep,
**organizing session on***infinite-dimensional ISS* - IWOTA 2022, Cracow, Sep:
**organizing session Functional calculus and spectral constants** - GAMM Annual meeting 2022, Aachen, Aug
**WOSTAP**: together with Marcus Waurick (TU Freiberg), we are organizing a Workshop on Systems Theory and PDEs (WOSTAP), July 18-22. Registration is open- research stay at Lund University, March
- research stay at University of Bordeaux, March

- research stay and seminar talk at Lund University, Nov
- talk in
*Online Seminar on ISS*, Nov - SCINDIS 2021invited speaker, Sep
- IWOTA 2021, Lancaster, Aug
- 13th International ISAAC Congress, Gent, Aug
**organizing**Mini-Workshop: Mathematics of Dissipation – Dynamics, Data and Control

(together with S. Grundel, J. Scherpen, V. Mehrmann),

Mathematisches Forschungsinstitut Oberwolfach, May 9-15- Oberseminar Analysis TU Dresden, May 6
- One-Parameter Semigroups of Operators (OPSO 2021), April 5-9
- Small Collaboration: Numerical Analysis of Electromagnetic: Twente/Duisburg-Essen

Mathematisches Forschungsinstitut Oberwolfach, March 21-26 - Oberseminar Passau (online), Jan 11

- Annual meeting of NDNS+ cluster (Nonlinear Dynamical Systems of Natural Systems),

virtual talk, June *Lothar-Collatz Seminar*, University of Hamburg, virtual talk, May- Talk in
*Online Seminar in Linear Algebra and Operator Theory (Oselot)*, May 7 *SACS Seminar*, University of Twente, March- Elgersburg Workshop 2020, Elgersburg (GER), Feb 24-28

with Thomas Berger, Paderborn, DMV Annual meeting, TU Chemnitz (virtual meeting), Sep 14-18

- Conference
*Operator Theory and Krein spaces*

Vienna (AUT), Dec **organized:***8th Weihnachtskolloquium*, Vienna University of Technology, Dec 20- Conference Interpolation in Spaces of Analytic Functions

invited talk, CIRM Luminy (FRA), Nov **organized:**Workshop on the occassion of Hans Zwart's 60th birthday,

with B. Jacob, University of Twente, Oct 25-26- lecturer at summerschool
*Unitary Dilations and Interpolation Problems*,

Gruenau (AUT), Sep 28-30 - IWOTA 2019,
Lisbon (POR), July 22-26
**organized**Session `Functional calculus, spectral sets and constants' (with Wojtylak, Kosinski) - Applied Math Seminar at University of Waterloo, Waterloo (CAN), July 3 3
- 'Focused research group on extremal Blaschke products' at BIRS, Banff (CAN), June 23-30
- seminar talk, University of Passau, Passau (GER), June 13
**organized***Kick-Off: International HUB Norddeutschland des TU Wien Alumni Clubs*,

Hamburg, April 26**organized***Mini-Workshop on Operator Theory*, University of Hamburg, April 25- Elgersburg Workshop 2019, Elgersburg (GER), Feb 24-28
- GAMM 2019, Vienna (AUT), Feb 18-22
**organized**Minisymposium*Input-to-state stability of distributed parameter systems* **organized**Bremen-Hamburg^2-Kiel-Seminar, TU Hamburg-Harburg (GER), Jan 21- seminar talk in functional analysis seminar, TU Wien, Vienna, Jan 7
**Organized:***7th Weihnachtskolloquium*, Vienna University of Technology, Dec 21*Invited seminar talk*, host: Michael Hartz, Fernuni Hagen (GER), Nov 29- Workshop on Stability and Control of Infinite-Dimensional Systems SCINDIS-2018,

Wuerzburg (GER), Oct - Summer School on Control of Evolution Equations,

Wuppertal (GER), Oct - plenary talk at Workshop of the 21st Internetseminar "Functional Calculus",

Wuppertal (GER), Jul - Workshop on Operator Theory, Complex Analysis, and Applications (WOTCA) 2018,
*invited talk*, Guimaraes (POR), Jun - Reserach stay and
*invited seminar talk*, host: Lars Gruene, Bayreuth (GER), Jun *Invited seminar talk*, host: Robert Altmann, Augsburg (GER), Jun- Research stay and
*invited seminar talk*, Jagiellonian University

(one week, guest of M. Wojtylak and L. Kosinski), Krakow (POL), May - 6th Miniworkshop Operator Theoretic Aspects of Ergodic Theory, Wuppertal (GER), May
- GAMM 2018,
**organized**Section*Applied Operator Theory*, Munich (GER), Mar - GDMV 2018,
*invited talk in session: Functional Analysis*, Paderborn (GER), Mar - Elgersburg Workshop 2018,
*invited talk*, Elgersburg (GER), Feb *Invited seminar talk,*TU Dresden, Oberseminar Analysis, Dresden (GER), Jan 25- Workshop on „Control theory of infinite-dimensional systems", Hagen (GER), Jan

**Organized:***6th Weihnachtskolloquium*, Vienna University of Technology, Dec 22.- Research stay (one week, guest of O. Nevanlinna), Espoo (FIN), Dec
- Research stay (one week, guest of J.R. Partington), Leeds (UK), Sep
- IWOTA 2017, Chemnitz (GER), Aug
- Workshop on "Crouzeix's conjecture ", AIM-San Jose (CA, USA) , Aug
- Control of Distributed Parameter Systems (CDPS), Bordeaux (FRA), July
- Mathematical aspects of the physics with non-self-adjoint operators, CIRM-Luminy (FRA), June
- Operator Semigroups: Modern Developments, Bedlewo (POL), April
- GAMM 2017, Weimar (GER), March
- Elgersburg Workshop 2017, Elgersburg (GER), Feb

- Operator Theory
and
Indefinite Inner Product Spaces, Vienna (AUT), Dec,
**organized**special session for young researchers*"Weihnachtskolloquium 2016"* *Invited talk at*INFDIM 16 --*Workshop on stability and control of infinite-dimensional systems.*Passau, Oct.-
*4th Heidelberg Laureates Forum*(4th HLF), Heidelberg, Sep. - IWOTA 16, St. Louis (US), July 18-22 ,

Invited talk in special session*"State space methods in operator and function theory" (organized by J. Ball, S. ter Horst)* *Invited seminar talk,*CAU Kiel, Oberseminar Analysis, Kiel, June 23.*2nd Workshop on Operator Theoretic Aspects of Ergodic Theory*, CAU Kiel, June 13-14.*Invited seminar talk,*TU Wien, Functional analysis seminar, Vienna, May 22.*Invited talk,*Hagen-Wuppertaler Analysis-Tag, Wuppertal, May 5.- Spectral Theory and Applications: Conference in memory of Boris Pavlov, Stockholm, March.
- GAMM/DMV Jahrestagung 2016, Braunschweig, March.
- Elgersburg School 2016, Elgersburg, March.
*Invited seminar Talk*, KIT Karlsruhe (GER), Feb 3.*1st Workshop on Operator Theoretic Aspects of Ergodic Theory*, Wuppertal, Jan 29-30.

**Organized:***4th Weihnachtskolloquium*, Vienna University of Technology, December 22.*Invited Seminar Talk*, KU Eichstaett (GER), December 16.*Mini-Workshop: Recent Developments on Approximation Methods for Controlled Evolution Equations*,

MFO Oberwolfach (GER), November.*Young Researchers Workshop on Spectral Theory*, Bern (CH), October.**Organized:***Workshop on the occasion of PhD defense F. Schwenninger*,

Enschede (NL), September.*Summer School - Semigroups for Dynamical Systems: Perturbation, Positivity, Networks*, Wuppertal (GER), July.*Workshop of the GAMM Activity Group Applied Operator Theory*, Budapest (HUN), May.*Invited Seminar Talk at TUHH*, TU Hamburg-Harburg, May.*GAMM 2015*, Lecce (ITA), March.*7th Elgersburg School*, Elgersburg (GER), March.**Organized:***Neujahrskolloquium*, Vienna (AUT), January.

*VOTCAM 2014*, Lexington Va (US), November.*IWOTA 2014*, Amsterdam (NL), July.*MTNS 2014*, Groningen (NL), July.*Workshop on Port-Hamiltonian Systems*, Leiden (NL), March.*GAMM 2014*, Erlangen (GER), March.

*18th OeMG Congress and Annual DMV Meeting*, Innsbruck (AUT), September.*Operator Semigroups meet Complex Analysis, Harmonic Analysis*, Herrnhut (GER), June.

and Mathematical Physics*Encounters Between Discrete and Continuous Mathematics*, Budapest (HUN), May.*Young Functional Analysist's Workshop YFAW 2013*, Sheffield (UK), March.

*Spectral Theory and Differential Operators*, Graz (AUT), September.*9th Advanced Course in Operator Theory and Complex Analysis*, Sevilla (ESP), June.*Operator Theory, Analysis and Mathematical Physics (OTAMP 2012)*,

Barcelona (ESP), June.

*Workshops of the Internet Seminar*, Blaubeuren (GER), 2011, 2012, 2013.*Elgersburg Schools*, Elgersburg (GER), 2012, 2013.*VW Summer School 2010 Infinite Dimensional Operator Matrices -*, Berlin (GER), July 2010.

Theory and Applications