In 1971 Dorothy completed her PhD, and in 1972 she went to Lincolnshire to set up and head the Lincolnshire Department of Clinical Psychology. Dorothy obtained a research grant which enabled her to continue her research. This research became the basis of her first book The Experience of Depression, now called Choosing Not Losing.
She became freelance in 1986 and has continued to write for variously publications and has done several radio and television interviews.