Timothy Thullen

Timothy Thullen is an accomplished professional in the field of toxicology, currently serving as the Director of Toxicology at Leal Therapeutics since August 2025. Prior to this role, Timothy held the position of Senior Director of Toxicology at ToxAlliance LLC for a brief period in 2025. Timothy's extensive experience includes serving as the Executive Director of Nonclinical Development at Third Harmonic Bio from July 2021 to February 2025, as well as the Director of Regulatory Toxicology at Wave Life Sciences and the Director of Toxicology at X4 Pharmaceuticals. Timothy obtained a PhD in Pathobiology and Molecular Medicine from the University of Cincinnati College of Medicine and a BA in Biology from Hiram College.