John T. Hancock, BSc, PhD, is a Professor of Cell Signalling at the College of Health, Science and Society School of Applied Sciences, University of the West of England. He teaches molecular biology and biochemistry and performs research on cell signalling. He has had many administration roles at UWE and, presently, he is Chair of the University Ethics and Integrity Committee. He has a long-standing interest in cell signalling and redox biology. He tries to bring these together as much as possible in his research. He has authored "Cell Signalling" by OUP (now 4th ed) and has published several reviews on nitric oxide and reactive oxygen species, and most recently on hydrogen sulfide.