since 2006 Director and Chairman of the University Eye Clinic in Bochum
2013-18 Chair of AAO Cataract Refractive Committee
2016-20 President of GSCRS
2018-2022 AAO/ISRS International Council, Representative for Germany
2018-19 President of AECOS Europe
2020 AAO/ISRS Externship programme Chair
2020-21 Refractive AAO/ISRS SubDay Programme Committee Chair
2021-24 Treasurer of GSCRS (DGII)
since 2022 AAO International Committee, Regional Advisor
since 2022 Elected Council member, ESCRS
2022-24 Chair of Research Committee, ESCRS
since 2023 Mentor of Medicus scholarship, German University Foundation
since 2023 Secretary, ESCRS
since 2024 General Secretary, GSCRS (DGII)
since 2025 President Elect, ESCRS