Gerhard Horstmann

M. Nießen is a radiation therapy specialist at the clinic’s MVZ Gamma Knife Center Krefeld, working there since 2024. He joined the clinic team as a new physician colleague effective 01.01.2024. His prior experience includes work in neurology as an assistant doctor at Uniklinikum Bonn, followed by radiation therapy specialist training at University Hospital Essen and in an MVZ for radiation therapy in Leverkusen. Before joining the clinic’s Krefeld radiosurgery environment, he worked as a radiation therapy specialist at the West German Proton Center at University Hospital Essen from 1.7.2022, and he also practiced radiation therapy at MVZ radiation therapy Med360° Leverkusen in 2022. In March 2024, Nießen attended the Leksell Gamma Knife Clinical Introduction course in Prague (25–28 March 2024) at Nemocnice Na Homolce Hospital. The course was led by Dr. Roman Liscak (neurosurgeon) and Dr. Josef Novotny (medical physics expert), and it focused on the precise application of Gamma Knife technology for brain tumor treatment.

Education

Not specified in the provided evidence.

Work experience

• Since 2024 — Specialist in Radiation Therapy at the MVZ Gamma Knife Center Krefeld.
• Since 01.01.2024 — new physician colleague at Gamma Knife Zentrum Krefeld.
• 2022–2023 — Specialist in Radiation Therapy at the West German Proton Center, University Hospital Essen.
• Since 1.7.2022 — Specialist in Radiation Therapy at the West German Proton Center in Essen.
• 2022 — Specialist in Radiation Therapy at MVZ radiation therapy Med360° Leverkusen.

Clinical focus and techniques

Nießen’s Gamma Knife-related training supports precise radiosurgery and radiation therapy workflows.

• Gamma Knife radiosurgery (Leksell Gamma Knife Clinical Introduction course; precise application mentioned in course description).

Professional societies and certifications

Not specified in the provided evidence.

Academic output

Not specified in the provided evidence.

Courses and advanced training

• Leksell Gamma Knife Clinical Introduction — 25–28 March 2024, Nemocnice Na Homolce Hospital, Prague; led by Dr. Roman Liscak and Dr. Josef Novotny.

Awards and recognition

Not specified in the provided evidence.

As part of the clinic’s radiation therapy team, Nießen supports coordinated care for patients receiving Gamma Knife radiosurgery. The clinic’s approach is designed to keep treatment planning and delivery within one center, before, during, and after therapy.