Dr. Arbet-Engels joined X4 in August 2023 as Chief Medical Officer. He brings to X4 more than 25 years of experience in strategic global drug discovery, development, and commercialization across a broad range of therapeutic areas including gastroenterology, cardiovascular-metabolism, neurology, oncology, and rare and orphan diseases.

Dr. Arbet-Engels previously served as Chief Medical Officer at several life science companies, including Neurogastrx, Millendo Therapeutics, and Poxel Pharmaceuticals, where he provided research and development leadership, advancing multiple candidates from pre-clinical through to late-stage clinical trials and assisting with both financial and strategic partnering transactions. Prior to these roles, he held a variety of senior medical and clinical positions at Biogen, Boehringer-Ingelheim Pharmaceuticals, Hoffmann-La Roche, Merck Research Laboratories, Aventis Pharmaceuticals, and Ligand Pharmaceuticals, where he led clinical development and registration, launch, and lifecycle management efforts for several new medicines, including the blockbuster therapies LANTUS® and JARDIANCE®.

Dr. Arbet-Engels has also served in educational roles at The Salk Institute for Biological Studies, University of Paris VI, and the Assistance Publique, Hospitals of Paris, and currently serves as a Member of the Board of Tutors in Biochemical Sciences at Harvard University. He received his MD and PhD in internal medicine/endocrinology-metabolism from the University of Paris, France, and completed his MBA at Rutgers University.

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  Chief Medical Officer in X4 Pharmaceuticals

  Enabling a better future for people with rare immune disorders