Highly educated and a devoted father and husband, Dr Paul Wood's past isn't immediately obvious.
But his job is now devoted to that past.
Aged 18, as an unemployed high school drop out who was dependent on drugs, he was committing crimes to feed his habit.
While struggling with the death of his mother, Wood killed his 42-year-old drug dealer after he attempted to sexually assault him. Wood was convicted of murder and served 11 years in prison.
Another convicted killer, John Barlow — sentenced in 1995 for murdering Eugene and Gene Thomas — was among other prisoners who encouraged the teenager to educate himself behind bars.