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is an associate professor
A professor is a scholarly teacher; the precise meaning of the term varies by country. Literally, professor derives from Latin as a "person who professes" being usually an expert in arts or sciences; a teacher of high rank...
of criminal justice
Criminal Justice is the system of practices and institutions of governments directed at upholding social control, deterring and mitigating crime, or sanctioning those who violate laws with criminal penalties and rehabilitation efforts...
and director of the Kenneth B. Clark Center for the Study of Violence in Communities.
He wrote "A World of Gangs."
"People and Folks: Gangs, Crime and the Underclass in a Rustbelt City"