Come on people, get a grip! Here is just part of the Wikipedia entry for Carson:
"He was the Director of Pediatric Neurosurgery at Johns Hopkins Hospital from 1984 until his retirement in 2013. As a pioneer in neurosurgery, Carson's achievements include performing the first and only successful separation of Siamese twins joined at the back of the head, pioneering the first successful neurosurgical procedure on a fetus inside the womb, performing the first completely successful separation of type-2 vertical craniopagus twins, developing new methods to treat brain-stem tumors and reviving hemispherectomy techniques for controlling seizures. Carson became the youngest chief of pediatric neurosurgery in the country at 33. He has received more than 60 honorary doctorate degrees, dozens of national merit citations, and written over 100 neurosurgical publications. In 2008, he was bestowed the Presidential Medal of Freedom, the highest civilian award in the United States."
Here is the entry for Julian Castro, current HUD Secretary:
"From 2009 to 2014, Castro served as mayor of his hometown, San Antonio, Texas until he was invited by Obama to join his Cabinet."