Benjamin Solomon Carson Sr. is an American retired neurosurgeon and politician who served as the 17th United States Secretary of Housing and Urban Development from 2017 to 2021. He was a candidate for President of the United States in the 2016 Republican primaries. He is considered a pioneer in the field of neurosurgery.
Carson became the director of pediatric neurosurgery at the Johns Hopkins Children's Center in 1984 at age 33, then the youngest chief of pediatric neurosurgery in the United States. At retirement, he was professor of neurosurgery, oncology, plastic surgery, and pediatrics at the Johns Hopkins School of Medicine. Carson's achievements include participating in the first reported separation of conjoined twins joined at the back of the head. Although surgically a success, the twins continued to suffer neurologic/medical complications. Additional accomplishments include performing the first successful neurosurgical procedure on a fetus inside the womb, developing new methods to treat brain-stem tumors, and revitalizing hemispherectomy techniques for controlling seizures. He wrote over 100 neurosurgical publications. He retired from medicine in 2013.