Professor Sir Leszek Borysiewicz is a Welsh immunologist and scientific administrator. Sir Leszek was appointed as a Trustee to Cancer Research UK in July 2016 and as Chairman in November 2016. He served as the 345th Vice-Chancellor of the University of Cambridge for a maximum of seven years term of office starting in October 2010. Following a distinguished academic and clinical research career and prior to his appointment as Vice-Chancellor at the University of Cambridge, Sir Leszek’s roles included Chief Executive of the Medical Research Council from 2007 and Deputy Rector of Imperial College London from 2001 to 2007.

Sir Leszek was also a founding Fellow of the Academy of Medical Sciences and a fellow of the Royal Society. His work in vaccines included Europe’s first trial of a vaccine for human papillomavirus to treat cervical cancer and research conducted at the University of Cardiff.

Sir Leszek was knighted in the 2001 New Year’s Honours List for his contribution to medical education and research into developing vaccines, including pioneering work towards a vaccine to combat cervical cancer.