Trevor Griffiths studied medicine at Oxford University. He was a pioneering GP for 25-years, introducing counsellors and family therapy into his practice. For the last 15 years he has instead run the Emotional Logic Centre full-time, training Emotional Logic coaches in the UK and around the world to prevent mental illness and socially disruptive behaviour, not just to treat it.Marian Langsford is married to Trevor. She studied medicine at the Royal Free, London, and has used and researched Emotional Logic extensively in the medical practice they set up together. Now retired, she has joined Trevor in the international teaching of Emotional Logic, as well as enjoying their four grandchildren and cultivating their garden. As she says, 'Planting flowers that grow is at least as important as pulling up weeds.'

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• Introducing Emotional Logic - the missing link; Part 1 - Dr Marian's Emotional Logic casebook: The way I do Emotional Logic - Marian's garden; Chris and Peter resolve a conflict; Jess aged 8 turns her anger to good use; Caring for the carer; A fostered teenager stops self-harming; Harry's retirement treat; Post-childbirth PTSD; Transforming the workplace; Three generations enjoy Shelly and Friends; Part 2 -Emotional Logic in the community: A street gang leader learns to bargain; At the drop-in centre for street sleepers; De-radicalisation, trafficking, and multiple shootings; The Kenyan prison chaplain; Keeping hopeful - our work in schools; It is never too late - the Revival Choir; Appendix