Professor Gareth Griffiths is Professor of Clinical Trials within Medicine at the University of Southampton.

Professor Griffiths was appointed to the Chair of Clinical Trials and Director of the Southampton Clinical Trials Unit in July 2014. Having graduated with a BSc in Biological Sciences (joint statistics and biology) at Reading University, a MSc in Statistics in applications in Medicine at Southampton University and later a Phd in bladder cancer clinical trials at Cardiff University, has spent the majority of his career in the area of clinical trials. He has held the position of senior statistician/scientific lead at the MRC Clinical Trials Unit, London, Director of the National Institute for Social Care and Health Research (NISCHR - Wales) Cancer Registered Research Group and Director and founder of the Wales Cancer Trials Unit in Cardiff before his current appointment at Southampton University.

Professor Griffiths is the Director of the UKCRC registered Southampton Clinical Trials Unit (CTU) which is based within the Faculty of Medicine. Southampton CTU is Cancer Research UK (CRUK) core funded and receives National Institute for Health Research (NIHR) clinical trials unit support funding.