Ahmed Haider, PhD

Senior Scientist / Radio-Pharmacy

Achi (Ahmed) studied pharmacology and obtained his PhD degree in neuroimaging at the Swiss Federal Institute of Technology Zurich (ETHZ, CH) in 2018. For his work on the early diagnosis of neurodegenerative disorders, Achi was awarded the prestigious ETH Silver Medal. He is a passionate scientist and loves a vigorous scientific exchange. From 2018 to 2021 Achi completed his postdoctoral fellowship in both clinical and experimental imaging in the Gebhard Lab and then moved to Boston, where he worked in the field of radiochemistry at Harvard Medical School/Massachusetts General Hospital. In 2023 he returned to Europe and took on a new position as Senior Scientist at Roche Switzerland in Basel. Achi continues working with the Gebhard Lab, and given his broad expertise and enthusiasm for science, Achi is currently leading several prestigious research projects in the field of PET/MR imaging and Cardiovascular Gender Medicine.

Pubmed   ORCID 0000-0002-5204-4473


Pimrapat Gebert, MPH and PhD


Pimrapat is a biostatistician with over ten years of experience working with both observational and clinical trial data. She joined the Gebhardlab in October 2022 as a part-time biostatistician to support the research team with several clinical projects. She graduated with a bachelor's degree in nursing science and then a master's in public health in biostatistics from Khonkaen University (Thailand). After relocating to Germany, she completed her PhD studies and currently also works at the Institute of Biometry and Clinical Epidemiology at Charité Universitätsmedizin Berlin (Germany).



Atanas Todorov, MD, PhD

Postdoctoral Fellow / Biostatistics

Atanas is a physician scientist with experience in all phases of translation from bench to bedside, including primary in vitro and in vivo models, conceptualization, study design, graft preparation, implantation, and follow-up and data analysis in first-in-man/proof of concept trials in patients. His particular expertise lies in tendon, cartilage and bone biology and regeneration. Throughout his scientific and clinical career, he has become more and more involved in statistical computation and image analysis, leading him to a part-time postdoc in biostatistics in support of the Gebhard Lab team. His other focus is on state-of-the-art digitalization of medical work and healthcare institutions at Arcondis (CH).

Pubmed   ORCID 0000-0002-1225-4302


Nidaa Mikail, MD

MD-PhD Student

Nidaa is a nuclear medicine physician with a keen interest in cardiovascular imaging and always driven to learn new things. The excellent reputation of Uniersity Hospital of Zurich (CH), a stone's throw from his native Alsace, drew him to Zurich. Here, he is currently completing his PhD in our team. After graduating from the medical school of Strasbourg (FR), Nidaa completed his fellowship in Paris at Bichat University Hospital (FR). He then held a position as a senior consultant in both Bichat and Beaujon Hospitals near Paris. When he is in the office, you should never leave a box of sweets within his reach unless you want to get rid of it. In his leisure time, he enjoys music (an oud and guitar aficionado) and learning about the subtle differences between Dativ and Genitiv and between standard and Swiss German.

Pubmed   ORCID 0000-0003-4896-1428


Angela Portmann, M.Sc.

PhD Student

Angela (Angie) holds both B.Sc. and M.Sc. in Biology from Swiss Federal Institute of Technology Zurich (ETHZ, CH). She is currently pursuing her PhD in Biomedicine at the University of Zurich. Her research is focused on the identification of cardiovascular sex determinants for left ventricular hypertrophy and heart failure. She uses state-of-the-art imaging modalities including small animal cardiac Magnetic Resonance Imaging (MRI) and Positron Emission Tomography (PET). Angela also applies a broad range of molecular biology techniques to assess signal transduction pathways. Outside of the lab, she loves trying new recipes and food in her kitchen. Books are her constant companions and a good book is never missing from her bag.



Valerie Treyer, PhD

Senior scientist, saving angel and all-rounder

Valerie is a neuroscientist and senior scientist at the Department of Nuclear Medicine (USZ, CH) and at the Institute for Regenerative Medicine (UZH, CH). She has been conducting molecular and multimodal neuroimaging studies since 1998 and has strong experience in Magnetic Resonance (MR) and Positron Emission Tomography (PET) imaging technology. Valerie has also set-up and co-authored various imaging studies with colleagues from different areas of expertise ranging from cardiology, oncology to neuroscience. Her current research focus is on healthy aging. Valerie is always thinking outside the box and brings together brain, heart and hand not only in theory but also in practice.

Pubmed   ORCID 0000-0002-4584-3031


Ketina Arslani, MD


Ketina is a board-certified physician in internal medicine and cardiology, with a special interest in interventional cardiology and structural heart disease. During her medical training, she worked at the Department of Cardiology of the University Hospital Basel where she spent also one-year of critical care rotation and one year in clinical cardiovascular research at the Cardiovascular Research Institute Basel (CRIB) funded by the "Young Talents in Clinical Research" grant from the Swiss Academy of Medical Sciences. Ketina started her research and clinical fellowship in Interventional Cardiology at the Rigshospitalet in Copenhagen (Denmark) in 2021 funded by the "Postdoc Mobility" grant from the Swiss National Foundation. Given her interest in sex and gender differences in cardiovascular diseases and intensive care medicine, she is working and collaborating in different projects, including a recently published study on mortality trends in cardio -and neurovascular patients in Switzerland as a first author.



Bianca Gysi, MSc


Bianca graduated from medical school in 2021 at the University of Basel. She joined our research group the same year as a full-time doctoral student. She worked with our team on different research projects during the COVID-19 pandemic, investigating the impact of sex and gender on acute and long-term outcomes of SARS-CoV-2 infection. For her work in this field, she won the best oral presentation award at the Congress of the Swiss Society of Intensive Care Medicine in 2022. Since August 2022 Bianca works as a resident in Internal Medicine at the Bruderholzspital in Basel.



Michael Fiechter, MD, PhD

Clinical Research Fellow

Michael is chief of service and board-certified neurosurgeon specialized in spine surgery and spinal cord surgery at the Swiss Paraplegic Center in Nottwil (CH). He is also a passionate natural scientist. Thanks to his double degree in medicine and natural sciences, Michael combines experimental, translational and clinical research in functional neurovascular imaging to investigate the neuro-hematopoietic-vascular axis and its influence on cardiovascular outcome. Despite his intensive clinical and research commitments, Michael is the father of three lovely children, and has a passion for karate and endurance sports.

Pubmed   ORCID 0000000272930704


Alexander Meisel, MD

Clinical Research Fellow

Alex‘s focus is on oncology, cardio-oncology and cancer imaging. After his medical studies at the Ludwig Maximilian University of Munich (DE), he moved to Zurich to continue his clinical education in Medical Oncology at University Hospital Zurich (CH). Alex has also worked at the Stadtspital Waid as an attending physician and at Swiss Federal Institute of Technology Zurich (ETHZ, CH) to study novel Positron Emission Tomography (PET)-tracers in ovarian and lung cancer. He believes that precision oncology should not just be a long-term dream for the future, but part of the current cutting-edge of medicine. Alex seeks out the best possible treatment options for his patients and passionately implements novel imaging and sequencing techniques into daily clinical practice.

Pubmed   ORCID 0000-0003-2422-1281

University Hospital Inselspital Bern

Department of Cardiology
Freiburgstrasse 18
CH-3010 Bern

University Hospital Zurich

Department of Nuclear Medicine
Cardiovascular Gender Medicine
Rämistrasse 100
CH-8091 Zurich

University Hospital Basel

Department of Acute Medicine
Intensive Care Unit
Petersgraben 4
CH-4031 Basel