Daniel A. Hughes is a psychologist who specializes in working with children and young people with trauma/attachment problems and their families. He developed Dyadic Developmental Psychotherapy, a key feature of which is the parenting attitude of PACE, and Attachment Focused Family Therapy. He is the President of the Dyadic Developmental Psychotherapy Institute, Pennsylvania, USA. He is author of several books including Building the Bonds of Attachment, 2nd edition, and Attachment Focused Family Therapy Workbook.
Celia Foster lived in the UK and was the mother of two adopted sons.