Manfred Günther, is a German educational psychologist, specialised in young people, the prevention of violence and social therapy methods; today he works as an author and coach. He lives in Berlin, Germany and Tenerife, Spain.

The Glen Mills Schools was a youth detention center for juvenile delinquents located near Glen Mills in Thornbury Township, Delaware County, Pennsylvania, United States, for boys between 12 and 21 years of age. The school was founded in 1826 and was the oldest surviving school of its type in the United States until all residents were ordered removed on March 25, 2019, by the Pennsylvania Department of Human Services. The school's licenses were subsequently revoked for not complying with the state's Human Services Code and regulations.