Zak Williams, son of beloved actor Robin Williams, and Curtis Carroll, an inmate, co-teach a financial literary class at San Quentin State Prison in California.

Williams has an MBA from Columbia and spends a lot of his time studying behavioral finance and valuing tech companies.

Carroll, who was convicted at 17 and is now 36, started “picking stocks” 10 years ago. He started by reading a fellow inmate’s old copies of the Wall Street Journal. Now nicknamed “Wall Street,” he studies patterns and predicts which stocks will do well.

The two teamed up when Williams was looking to get involved in a prison rehabilitation program. He says that it has been helpful for him to give back following his father’s death last summer

Fortune | by Michal Addady