Nathan Mikaere Wallis is founder of X Factor Education in Christchurch.
He was formerly with the Brain Wave Trust and has been a lecturer at the Christchurch College of Education, lecturing in human development, brain development, language and communication and risk and resilience.
He says that there are two categories of teenage delinquents - those children who fall off the rails -which is fairly common, those who don't have an rails in the first place.
"A lot of teenage delinquency has its origins in early childhood."
He talks to Kathryn Ryan about the issues can cause teenagers to end up in the justice system.