Bradley was particularly interested in the psychology of human ageing and published extensively in this field.
Penguin Books published his first book on
The Psychology of Ageing in 1966 and a second edition was published in 1974. He subsequently published a follow-up entitled
Behavioural Gerontology. He was a Founding Fellow of the British Society of Social and Behavioural Gerontology (subsequently renamed the
British Society of Gerontology). A detailed account of his career was published in a collection on the history of gerontology. He also published a series of books on
person perception, popular personality description and
impression management. Finally, he published a popular text-book on the
case-study method. ==Awards==