Career
| 2010 | Specialist in allergology and immunology |
| 2006-2008 | Research project supported by the Swiss National Science Foundation |
| 2004 | Specialist in pediatrics |
| 1998 | State examination |
| 1992-98 | Medical studies |
Most important memberships
- Board of Medical Societies
- Past President of the International Society for Dermatologic Surgery (ISDS) (2023 – 2024)
- Past President of the Swiss Society of Dermatology and Venereology (SSDV) (2011 – 2015)
- Past President of the Swiss Society of Phlebology (SSP) (2019 – 2023)
- Past President of the Workforce for Dermatologic Angiology (ADA) of the DDG (2000-2004)
- Past Board Member of the Swiss Institute of Medical Education (SIME/SIWF/ISFM) (2010 – 2022)
- Past Board Member of the Foederatio Medicorum Chirurgicorum Helvetica (FMCH) (2007 – 2020)
- Past Founder Vice President of the Swiss Association of Wound Treatment (SAfW) (1996 – 2000)
- Board of Research Cooperations
- Founder and President of the JH-Rahn-Foundation for Dermatologic Surgery, Phlebology and Wounds (since 2010)
Research areas
- Skin cancer surgery, especially skin cancer surgery in old age, especially local anesthesia
- Scars and keloids
- Chronic wounds, especially hypertonic ulcers Martorell, especially compression therapy
- Hidradenitis suppurativa
- Prurigo nodularis
Publications
169 research papers, 4401 citations (Feb 2026), publication list on request
Further
Pledge for doctors (Swiss oath, modern version): Taken on 01.11.2018 in Montreux