(AREA) -- A federal judge in Detroit has sentenced a man to 20-years in prison and ordered him to make $2 million in restitution for defrauding the families of inmates with claims he could help them. Thursday's punishment exceeds the 17 1/2 year sentence that prosecutors sought for John Wilson of Yale. Federal prosecutors say the 57-year-old collected $2 million by promoting himself as a law expert who could win freedom for inmates across the country. He pleaded guilty to fraud and a tax crime. Assistant U.S. Attorney Sarah Resnick Cohen says Wilson was a "wolf in sheep's clothing" who targeted poor, vulnerable families whose loved ones were in prison. Wilson admits duping 2,100 people over a decade.