First, permanent steering committee memberships are listed. My conference attendance is linked here.

• Steering/Advisory Committee Memberships

• International Workshop on Bulk Nitride Semiconductors (IWBNS)
  Biennial workshop, about 80 participants (suspended since 2022)
  Member of the International Advisory Committee since 2005
• International Workshop on Crystal Growth Technology (IWCGT)
  Triennial workshop, about 120 participants
  Leader of the International Steering Committee since 2013
• German-French Workshop on Oxide, Dielectric, and Laser Crystals (WODIL)
  Annual workshop, alternating in Germany and France, about 40 participants
  Co-Organiser since 2016
• Conference Series on Defects-Recognition, Imaging and Physics in Semiconductors (DRIP)
  Biennial workshop, about 100 participants
  Member of the International Steering Committee since 2019

• Organization of Scientific Events

• 9. European Conference on Crystal Growth (ECCG-9)
  Potsdam, Jul 25–29, 2027
  Conference Chair and Chief Organizer (together with Wolfam Miller and Christiane Frank-Rotsch)
• International Workshop on Nitride Semiconductors 2026 (IWN 2026)
  Kumamoto, Japan, Nov 8-13, 2026
  Member of the Program Committee
• European Materials Research Society Fall Meeting 2026 (Symposium E) (EMRS Fall 2026)
  Warsaw, Poland, Sep 14–17, 2026
  Conference Chair and Chief Organizer Symposium E: Wide and Ultra-Wide-Bandgap Semiconductors Challenges: From Materials to Applications
• 9. International Workshop on Crystal Growth Technology (IWCGT-9)
  Berlin, Jun 8–11, 2026
  Conference chair and chief organizer
• Annual conference of the DGKK (DKT 2026)
  Karlsruhe, Mar 4–6, 2026
  Member of the Program Committee
• 8. International Symposium on the Growth of Nitrides (ISGN-8)
  Tainan, Taiwan, Nov 9-12, 2025
  Member of the Program Committee
• Annual conference of the DGKK (DKT 2025)
  Frankfurt, Mar 5-7, 2025
  Member of the Program Committee
• International Workshop on Nitride Semiconductors 2024 (IWN 2024)
  Oahu, Hawaii, USA, Nov 3-8, 2024
  Member of the Topical Program Committee Bulk Growth Sessions
• DGKK workshop on "Bulk Semiconductor Crystals"
  Berlin-Adlershof, Oct 9-10, 2024
  Conference chair and chief organizer
• 8. European Conference on Crystal Growth (ECCG-8)
  Warsaw, Poland, Jul 21-25, 2024
  Member of the International Advisory Committee
• 10. International Conference on Nitride Semiconductors (ICNS-14)
  Fukuoka, Japan, Nov 12-17, 2023
  Member of the Program Committee
• 12. German-French Workshop on Oxide, Dielectric, and Laser Crystals (WODIL 2023)
  HU Berlin, Sep 21-22, 2023
  Conference chair and chief organizer
• DFG Research Group FOR 5044 Summer School
  IKZ Berlin, Sep 6-8, 2023
  Head of the Local Organization Comittee
• 20. International Conference on Crystal Growth (ICCGE-20)
  Naples, Italy, Jul 30-Aug 4, 2022
  Member of the Program Committee
• 6. International Workshop on UV Materials and Devices 2023 (IWUMD 2023)
  Metz, France, Jun 5-8, 2023
  Member of the Program Committee and Session chair
• Advanced Solid State Lasers Conference of the OSA (ASSL 2022)
  Barcelona, Spain, Dec 11-15, 2022
  Member of the Materials Program Committee
• International Workshop on Nitride Semiconductors 2022 (IWN 2022)
  Berlin, Oct 9-14, 2022
  Member of the Program Committee for the symposium on Growth
• 19. Conference on Defects-Recognition, Imaging and Physics in Semiconductors (DRIP-19)
  online (planned for Yokohama, Japan), Aug 28-Sep 1, 2022
  Member of the Steering Committee
• 7. European Conference on Crystal Growth (ECCG-7)
  Paris, France, Jul 25-27, 2022
  Session Chair "Semiconductors"
• 8. International Workshop on Crystal Growth Technology (IWCGT-8)
  Berlin, May 29-Jun 2, 2022
  Conference chair and chief organizer
• 5. International Workshop on UV Materials and Devices 2022 (IWUMD 2022)
  Jeju, Korea, May 23-27, 2022
  Member of the Program Committee
• Annual conference of the DGKK (DKT 2021)
  IKZ Berlin, Oct 6-8, 2021
  Conference chair and chief organizer
• Advanced Solid State Lasers Conference of the OSA (ASSL 2021)
  online (planned for Toronto, Canada), Sep 13-16, 2021
  Member of the Materials Program Committee
• Advanced Solid State Lasers Conference of the OSA (ASSL 2020)
  online (planned for Quebec, Kanada), Oct 12-16, 2020
  Member of the Materials Program Committee
• 9. German-French Workshop on Oxide, Dielectric, and Laser Crystals (WODIL 2020)
  IKZ Berlin, Sep 17-18, 2020
  Conference chair and chief organizer
• DGKK workshop on "Bulk Semiconductor Crystals"
  IKZ Berlin, Oct 9-10, 2019
  Conference chair and chief organizer
• 4. International Workshop on UV Materials and Devices 2019 (IWUMD 2019)
  St. Petersburg, Russia, Sep 8-13, 2019
  Member of the Program Committee
• 18. Conference on Defects-Recognition, Imaging and Physics in Semiconductors (DRIP-18)
  Berlin, Sep 8-12, 2019
  Conference chair and chief organizer (together with Anna Mogilatenko)
• 13. International Conference on Nitride Semiconductors (ICNS-13)
  Bellevue, Washington, USA, Jul 7-12, 2019
  Member of the Program Committee
• Joint annual conference of the DGKK and the PTWK (DKT 2019)
  Poznan, Poland, Mar 17-21, 2019
  Organizer of the session "Dielectrics and intermetallics" (with Andreas Erb)
• International Workshop on Nitride Semiconductors 2018 (IWN 2018)
  Kanazawa, Japan, Nov 11-16, 2018
  Member of the Program Committee, of the Topical Committee for Session A (Bulk Growth), and Session Chair
• European Materials Research Society Fall Meeting 2018 (Symposium P) (EMRS Fall 2018)
  Warsaw, Poland, Sep 17-20, 2018
  Conference chair and chief organizer Symposium P: Epitaxial Oxide Films for Electronic Applications
• 2. International Workshop on UV Materials and Devices 2017 (IWUMD 2017)
  Fukuoka, Japan, Nov 14-18, 2017
  Member of the Program Committee
• 7. International Workshop on Crystal Growth Technology (IWCGT-7)
  Potsdam, Jul 2-6, 2017
  Conference chair and chief organizer
• International Workshop on Nitride Semiconductors 2016 (IWN 2016)
  Orlando, Florida, USA, Oct 2-7, 2016
  Member of the Program Committee, of the Topical Committee for Session A (Bulk Growth), and Session Chair
• European Materials Research Society Fall Meeting 2016 (Symposium F) (EMRS Fall 2016)
  Warsaw, Poland, Sep 19-22, 2016
  Conference chair and chief organizer Symposium F: AlN and AlGaN Materials and Devices
• 5. German-French Workshop on Oxide, Dielectric, and Laser Crystals (WODIL 2016)
  IKZ Berlin, Sep 15-16, 2016
  Conference chair and chief organizer
• German-Japanese Gallium Oxide Technology Meeting 2016 (GAO 2016)
  IKZ Berlin, Sep 7-9, 2016
  Conference chair and chief organizer
• 18. International Conference on Crystal Growth and Epitaxy (ICCGE-18)
  Nagoya, Japan, Aug 7-12, 2016
  Member of the Program Committee
• 6. International Symposium on the Growth of Nitrides (ISGN-6)
  Hamamatsu, Japan, Nov 8-12, 2015
  Member of the Program Committee and Session chair
• 9. International Workshop on Bulk Nitride Semiconductors (IWBNS-IX)
  Oak Valley, Wonju, South Korea, Nov 2-6, 2015
  Member of the Program Committee and Session chair
• DGKK workshop on "Bulk Semiconductor Crystals"
  IKZ Berlin, Oct 7-8, 2015
  Conference chair and chief organizer
• 11th International Conference on Ceramic Materials and Components for Energy and Environmental Applications (CMCEE-11)
  Vancouver, Canada, Jun 14-19, 2015
  Co-Organisator of Session FS5: Crystalline materials and devices for electro-optical and biomedical applications
• 6. International Workshop on Crystal Growth Technology (IWCGT-6)
  Berlin, June 15-19, 2014
  Conference chair and chief organizer
• International Workshop on Nitride Semiconductors 2012 (IWN 2012)
  Sapporo, Japan, Oct 15-19, 2012
  Member of the Program Committee and Session chair
• DPG Spring Meeting on Condensed Matter 2012 (DPG 2012)
  TU Berlin, Mar 26-30, 2012
  Co-Organisator of Session HL 46: AlGaN materials for ultraviolet light emitters
• 30. Annual Conference of the DGKK (DKT 2000)
  University of Erlangen, Mar 20-22, 2000
  Member of the Local Organization Committee (Chair: Prof. G. Müller)

• 2027

• 2026

• 2025

• 2024

• 2023

• 2022

• 2021

• 2020

• 2019

• 2018

• 2017

• 2016

• 2015

• 2014

• 2012

• 2000

• ASSL (Optica) Conferences

• Conferences starting with C

• Conferences starting with D (except DGKK)

• DGKK Workshops

• DGKK Annual meetings

• European Conference on Crystal Growth

• European Material Research Society Meetings

• Conferences starting with F

• Conferences starting with G

• Conferences starting with I (except IWCGT, IWN and IWUMD)

• Int. Workshop on Crystal Growth Technology

• Int. Workshop on Nitride Semiconductors

• Int. Workshop on UV Materials and Devices

• WODIL Annual Meetings

• Conferences on Crystal Growth

• Conferences on Nitride Semiconductors

• Other topics (Materials, Characterization, Devices)

• National Workshops on Crystal Growth