I'm a federal prison consultant. Here's how I went from being in prison to helping clients get ready to go behind bars.

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I'm a federal prison consultant. Here's how I went from being in prison to helping clients get ready to go behind bars.

Sam Mangel.Kenneth A Appelbaum.Sam Mangel, a former convict, now works as a federal prison consultant.He uses his personal experience to help defendants navigate the system and reduce their sentences.After spending time in custody, Mangel learned that knowledge is power in prison.This as-told-to essay is based on a conversation with Sam Mangel, a federal prison consultant with his own firm. Mangel went into the field after pleading guilty to wir…