Kirby is a Cognitive Analytic Psychotherapist and supervisor. He has worked in the addiction field since 1991. He was Head of Treatment at Clouds House from 1999 until taking up the role of Treatment Director for Action on Addiction in 2007. Since leaving the charity in 2015 he has worked with Nick Barton as a consultant, assisting with programmeme design and supervision for European clients. In addition to this Kirby has returned to his former occupation as a professional guitarist and singer.