Hilmi Orhan is a professor in the Department of Toxicology at Ege University, Izmir, Turkey. He obtained his Ph.D. in Pharmaceutical Toxicology from Hacettepe University in 2000. He was a visiting fellow at Vrije Universiteit, The Netherlands in 1995. During his Ph.D., he received a TUBITAK/NATO A2 grant and conducted research in the Division of Molecular Toxicology of the same university (1997–1999). He was invited by the same department as a post-doctoral fellow for another two years (2001-2003), and several months in 2004, 2008 and 2010. He served as the Secretary General of the Turkish Society of Toxicology 2005–2011, until elected as president of the society in 2011, and was re-elected for the same position in 2013. Dr. Orhan was a visiting fellow in The Scripps Research Institute-Jupiter (USA) in 2013, and in the Department of Pharmacology, Toxicology and Therapeutics of Kansas University (USA) in 2018. He served as the secretary general for the Molecular Toxicology Specialty Section of the Federation of European Toxicologists and European Societies of Toxicology (EUROTOX) since 2009, and he was elected as the chair of this section in 2014. He was a member of the Executive Committee of EUROTOX (2013-2019). Dr. Orhan was the recipient of a Bo Holmstedt Fellowship Award in 2008, and of SOT - Global Senior Scholar Exchange Program Award in 2018. He obtained his European Registered Toxicologist title in 2008. He has been member of the Editorial Board of the journals Environmental Toxicology and Pharmacology, Current Research in Toxicology (Elsevier), and Applied In Vitro Toxicology (Mary Ann Liebert). Dr. Orhan’s current research interest involves the characterization of reactive intermediates upon biotransformation of drugs and drug candidates by target organs and subcellular compartments such as mitochondrion, and their contribution to adverse effects. He is also interested in biological activity screening and preclinical safety profile identification of drug candidates.