Team: Employee Archive

Achi Haider, PhD

Senior Scientist / Radio-Pharmacy

Achi 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

Team: Employee - 08/30/2023

Nidaa Mikail, MD, PhD candidate

Senior Scientist

Nidaa is a nuclear medicine physician with a keen interest in cardiovascular imaging and always driven to learn new things. Drawn by the excellent reputation of the University Hospital Zurich (Switzerland) and its proximity to his native Alsace, he joined our team, where he is currently pursuing a PhD focused on the mechanisms underlying sex and gender differences in heart–brain crosstalk. 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

Team: Employee - 08/28/2023

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

Team: Employee - 08/26/2023

Michael Fiechter, MD, PhD

Senior Scientist

Michael is head physician and a board-certified neurosurgeon specializing in spine and spinal cord surgery at the Swiss Paraplegic Center in Nottwil. With a dual degree in medicine and natural sciences, he combines experimental, translational, and clinical research in functional neurovascular imaging to investigate the neuro-hematopoietic-vascular axis and its impact on cardiovascular outcomes. Alongside his clinical and research responsibilities, Michael is the father of four children and pursues his passions for karate and endurance sports.

Pubmed ORCID 0000‐0002‐7293‐0704

Team: Employee - 08/24/2023

Alexander Meisel, MD

Senior Scientist

Alex focuses on oncology, cardio-oncology, and cancer imaging. After completing his medical studies at Ludwig Maximilian University of Munich (Germany), he continued his clinical training in Medical Oncology at the University Hospital Zurich (Switzerland). He has also served as an attending physician at Stadtspital Waid and conducted research at the Swiss Federal Institute of Technology Zurich (ETH Zurich), studying novel Positron Emission Tomography (PET) tracers in ovarian and lung cancer. He is currently an attending physician in Oncology at the Kantonsspital Glarus. Alex is committed to making precision oncology not just a vision for the future but a reality in today’s clinical practice. He is dedicated to identifying the best treatment options for his patients and integrating novel imaging and sequencing technologies into everyday care.

Pubmed ORCID 0000-0003-2422-1281

Team: Employee - 08/22/2023

Adriana Vinzens, MSc

Clinical Research Fellow

Adriana joined our team in 2021 to conduct her master’s thesis on the impact of perivalvular inflammation after Transcatheter Aortic Valve Implantation on long-term outcomes, work that earned her the Semester Award from the University of Zurich in 2023. She continued her research with our group before graduating from medical school at the University of Zurich in 2024. She is currently pursuing her doctoral thesis in the Department of Infectious Diseases at the University Hospital Zurich and, since April 2025, has been working as a resident in internal medicine at Kantonsspital Baden. Outside of medicine, Adriana enjoys singing and indoor bouldering.

Pubmed

Team: Employee - 08/20/2023

Valentina Tröster, MD

Clinical Research Fellow

Valentina is a board-certified internist and current fellow in intensive care medicine at the University Hospital Basel. During her residency, she completed a research year at the Cardiovascular Research Institute Basel (CRIB), where she finalized her doctoral thesis. This work was recognized with the Albrecht von Haller Award of the Swiss Heart Foundation. Her current research focuses on critically ill patients, with a particular interest in how sex and gender differences influence treatment and outcomes in intensive care.

Pubmed

Team: Employee - 08/18/2023

Ketina Arslani, MD

CLINICAL RESEARCH FELLOW

Ketina is a board-certified internist and cardiologist with a specialization in interventional cardiology and structural heart disease. She trained at the University Hospital Basel, completing rotations in critical care and clinical cardiovascular research at CRIB, supported by the Young Talents in Clinical Research grant. In 2021, she pursued a research and clinical fellowship in Interventional Cardiology at Rigshospitalet, Copenhagen, funded by the Postdoc Mobility grant of the Swiss National Science Foundation. She is now a staff interventional and structural cardiologist at the University Hospital Basel and conducts research on sex and gender differences in cardiovascular disease and intensive care, with recent first-author work on mortality trends in cardio- and neurovascular patients in Switzerland.

Pubmed

Team: Employee - 08/17/2023

Bianca Gysi, MSc

CLINICAL RESEARCH FELLOW

Bianca graduated from medical school at the University of Basel in 2021 and joined our research group the same year as a full-time doctoral student with her project “Decoding Sex and Gender Effects on Health: Evidence from a Nationwide Cohort.” During the COVID-19 pandemic, she also contributed to projects investigating sex and gender influences on acute and long-term outcomes of SARS-CoV-2 infection. For this work, she received the Best Oral Presentation Award at the 2022 Congress of the Swiss Society of Intensive Care Medicine. Since 2022, Bianca has been training as a resident in Internal Medicine at Kantonsspital Baselland.

Pubmed

Team: Employee - 08/16/2023

Pimrapat Gebert, MPH and PhD

Biostatistician

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).

Pubmed

Team: Employee - 08/14/2023

Achi Haider, PhD

Nidaa Mikail, MD, PhD candidate

Valerie Treyer, PhD

Michael Fiechter, MD, PhD

Alexander Meisel, MD

Adriana Vinzens, MSc

Valentina Tröster, MD

Ketina Arslani, MD

Bianca Gysi, MSc

Pimrapat Gebert, MPH and PhD

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Department of Clinical Research