Mark Johnson is a rehabilitated offender and former drug user, bestselling author of Wasted and the founder of the charity User Voice. User Voice was built on using the strengths of people and ignoring what others see as deficiencies. User Voice focuses on the strengths of lived experience not on the perceived weaknesses of lack of education, qualifications and professional track record. The lived experience of someone who has experienced drug addiction, or time spent in prison, as expertise.