| 2019 -2020 | President, International Pediatric Endosurgery Group (IPEG) |
| 2013 -dato | Director, Department of Pediatric and Adolescent Surgery, Medical University of Graz |
| 2012 -heut | Head, Devision of Pediatric Surgery, Medical University of Graz |
| 2006 -2012 | Director, Department of Paediatric Surgery, University of Leipzig |
| 2004 -2005 | Associate Professor an der Chinese University of Hong Kong Department of Surgery, Division of Paediatric Surgery and Paediatric Urology Chief: Prof. CK Yeung |
| 2001 | Board Certification for Pediatric Surgery |
| 2000 | PhD |
| 1999 -2004 | Consultant in Pediatric Surgery |
| 1998 | Board Certification General Surgery |
| 1991 -1999 | Resident in Pediatric Surgery |
| 2016 | Best scientific presentation der IPEG |
| 2002 | Drachter–Preis der Deutschen Gesellschaft für Kinderchirurgie |
| 2015 -2017 | International Pediatric Endosurgery Group (IPEG) Vizepräsident |
| 2013 -2017 | Österreichische Gesellschaft für Kinderchirurgie Mitglied des Vorstands |
| 1998 -2017 | European Pediatric Surgical Association (EUPSA) Mitarbeit in unterschiedlichen Gremien, insbesondere 6 Jahre scientific office |
| 1995 -2003 | Deutsche Gesellschaft für Kinderchirurgie unterschiedliche Funktionen, u.a. 6 Jahre Assistentensprecher |
| 2006 -2017 | JOURNAL OF LAPAROENDOSCOPIC & ADVANCED SURGICAL TECHNIQUES-PART A: European Editor |
| 1999 -2017 | EUROPEAN JOURNAL OF PEDIATRIC SURGERY |
| 2000 -2017 | JOURNAL OF PEDIATRIC SURGERY |
| 2002 -2017 | PEDIATRIC SURGERY INTERNATIONAL |
| 2011 -2017 | JOURNAL OF LAPAROENDOSCOPIC & ADVANCED SURGICAL TECHNIQUES-PART A |
| 2016 | Berufung: Mitglied: MUG |
| 2016 | Berufung: Mitglied: MUG Allgemeine Pädiatrie |
| 2011 | Berufung: Mitglied: Universität Leipzig |
| 2010 | Habilitation: Vorsitz: Universität Leipzig |
| 2025 | 15th Annual ESPES Congress; 15-17 Oct, 2025; Athens, GREECE; Panel "The Role of AI and ML in Pediatric MIS" Chair |
| 2025 | 15th Annual ESPES Congress; 15-17 Oct, 2025; Athens, GREECE; Session 16 "My Worst Complication" Chair |
| 2016 | International Hands-on Course: Fetal and Neonatal Endoscopic Surgery Mitglied Organisationskomitee |
| 2016 | 1st IPEG-ESPES Collaborative Masterclass on MIS in pediatric gastroesophageal Reflux, hernia and urology Mitglied Organisationskomitee |
| 2016 | Kinderchirurgie Highlights 2016 (Berlin) Mitglied Organisationskomitee |
| 2016 | Advanced Minimal Invasive Pediatric Surgery, 12 International workshop Mitglied Organisationskomitee |
| 2016 | 17th International Paediatric Surgical Week Chair |
| 2016 | IPEG endorsed Central and Eastern European Meeting of Neonatal and Pediatric Surgery Chair |
| 2015 | Kinderchirurgie Highlights 2015 Organisator |
| 2015 | International Hands-on course: Fetal and neonatal surgery Mitglied Organisationskomitee |
| 2015 | Advanced Minimal Invasive Pediatric Surgery, 11th International workshop Mitglied Organisationskomitee |
| 2015 | 16th International Paeditric Surgical Week Chair |
| 2015 | Eastern European Conference of Pediatric urology and nephrology Chair |
| 2014 | Kinderchirurgie Highlights Organisator |
| 2014 | International Hands-on course: Fetal and neonatal surgery Mitglied Organisationskomitee |
| 2014 | Advanced Minimal Invasive Pediatric Surgery, 10th International workshop Mitglied Organisationskomitee |
| 2014 | 15th International Paediatric Surgical week Chair |
| 2013 | Annual conference European Society of Pediatric Surgery (EUPSA) Chair |
| 2011 | 46. Weiterbildungsveranstaltung der Akademie für Kinderchirurgie Chair |
| 2011 | Annual conference International Pediatric Endosurgery Group (IPEG) Chair |
| 2010 | Seminar on Fetal and Neonatal Surgery (Trieste, Italy) Mitglied Organisationskomitee |
| 2007 | IPOKRATES Seminar Neonatal surgery (Leipzig, Germany) Chair |
| 2006 | Latest advances in Fetal and neonatal surgery (Hong Kong) Chair |
| 2002 | IPOKRATES Seminar Fetal and neonatal surgery (Munich) Chair |