In a gushing statement released by the Trump transition team, the President-elect said Carson "has a brilliant mind and is passionate about strengthening communities and families within those communities." But the sentiment of the future president differs a bit from the words of the former presidential candidate, who did not mince words when Carson was a rival for the Republican nomination.
Here's a look back at some of Trump's fiercest attacks on Carson.
Trump on Carson's experience
"I think Ben just doesn’t have the experience. It’s not his thing, you know you're born with it. It's not his thing. He doesn’t have the temperament for it."
Trump on Carson's energy
"Ben Carson is a very low energy person, actually, I think Ben Carson is even lower energy than Jeb [Bush], if you want to know the truth. We need strong energy."
Trump on Carson's temper
"I'm not saying it. He actually said 'pathological temper,' and then he defined it as disease. ... If you're pathological, there's no cure for that, folks. If you're a child molester, a sick puppy, there's no cure for that. There's only one cure. We don't wanna talk about that cure."
Before Trump nominated him, one of Carson's closest advisers suggested he wasn't up to the task of running a federal agency: "Dr. Carson feels he has no government experience, he's never run a federal agency. The last thing he would want to do was take a position that could cripple the presidency."
Now, of course, all parties involved have only glowing things to say about one another. In a statement on Monday, Carson said he was "honored" to accept Trump's nomination.
"I feel that I can make a significant contribution particularly by serving communities that are most in need," he said.