I would like to thank most particularly my two editors, Priscilla Roth and Richard Rusbridger, not only for their work in editing the papers and for their Preface, but also for encouraging me to put the papers together in the first place. They have been particularly generous in helping me to decide on suitable principles of selecting and ordering them.

I am also grateful to the Melanie Klein Trust, both for their support as colleagues and for their financial support, especially for my research in the Melanie Klein Archive. I would like to thank Dr Julia Sheppard, Dr Lesley Hall and the staff of the Wellcome Library for the History and Understanding of Medicine and for the generous help they have given me in this research.

To my children and my patients – the greatest thanks of all.