Thomas V. Mike Miller

Former Prince George’s County Executive Rushern Baker is joining the board of the troubled University of Maryland Medical System.

State Senate President Thomas V. Mike Miller selected Baker, a fellow Democrat, to be his appointee on the board.

“Former Executive Baker is well-versed in health care, and his reputation of hard work, and ethical behavior is renowned throughout the state,” Miller wrote in a letter Monday to James “Chip” DiPaula Jr., the board’s chairman.

The board is being reconstituted as a result of a state law passed this year after...