This book brings together leading scholars from the next generation of UK criminal lawyers to celebrate the work of G R (Bob) Sullivan, Emeritus Professor at University College London, in the year of his retirement from writing Simester and Sullivan's Criminal Law: Theory and Doctrine. The contributors examine areas in which Professor Sullivan's own writing has been influential, ranging from general doctrines such as causation and culpability, across specific offences like theft and fraud, through defences including necessity and insanity; before turning, finally, to matters affecting the criminal process, notably challenges to the doctrine of precedent in criminal law