"A powerful and timely book that combines practical examples with deep emotional insight, providing invaluable advice for everyone in today's modern workplaces." -- Dr Ann Limb CBE DL, Chair, The Scout Organization " Toxic is an important book and makes a powerful argument for executives to rethink about the business case for non-toxic environments. Lewis makes his points persuasively, underpinned by the evidence." -- Steve Murrells, Chief Executive, The Co-operative Group " Toxic is hugely insightful, and offers practical tips based on real examples to truly avoid or address toxic workplaces and relationships. This book reinforces the need for psychological safety in creating the right culture, and the reinforcement of the underrated but essential simple human traits of civility and respect hit you like a high speed train. This book is a must read!" -- James Devine, Chief Executive, Medway NHS Foundation Trust " Toxic is an excellent guide for organisations to learn how to improve cohesion at an individual, team and organisational level. We will certainly be drawing on its content." -- Dr Neil Pease, Chief People Officer, Nottingham University Hospitals.