Kelly left U.S. President Donald Trump's White House at the end of last year against the backdrop of changes to immigration policy.
Caliburn owns Comprehensive Health Services Inc, a private, for-profit company that runs a facility for unaccompanied migrant children in Homestead, Florida, some 35 miles south of Miami.
The site became a heated topic of debate, as immigration advocates and Democratic legislators complained many traumatized children who fled violence and poverty in their home countries were held in the institutionalized setting for too long before being released to sponsoring families who could better care for them.
Earlier in the day, CBS News report https://www.cbsnews.com/news/john-kelly-joins-board-of-caliburn-international-company-operating-largest-unaccompanied-migrant-children-sheltered Kelly's appointment.