IPT (interpersonal psychotherapy) has been proven effective in more than 250 studies; has been endorsed by the American and Canadian Psychiatric Associations and by the UK’s National Institute for Health and Clinical Excellence; and has been chosen by the World Health Organization as one of two psychotherapies to be disseminated worldwide As many as one third of those currently on anti-depressants (11% of Americans; nearly one in four middle-aged women) experience only moderate relief The authors founded the first private training institute devoted to IPT in 2001 and have since trained more than 2500 clinicians from around the world