The 6-10, 230-pound rising senior from Rice Lake (Wis.) High is one of the biggest stock climbers of the spring, vaulting into Top 25 status in the 2015 class.
UNC began recruiting Ellenson last July after viewing him at the Adidas Super 64 tournament in Las Vegas, and was intrigued by his skillset coupled with his 7-2 wingspan.
"I've gotten a lot of interest from North Carolina," he said. "They've been up in the gym in the fall, Roy came up during the season."
Flash ahead to this spring and Ellenson, having shed 20 pounds, made a big splash on the nation's toughest circuit - the EYBL.
He's made clear strides as a prospect. He's more mobile, fluid and athletic than this time last year. He creates mismatch problems with his versatility, as he has the hands, touch and post scoring ability to be a threat on the block, but can also face the rim and make jump shots.
"I'm a guy that can step out and hit a shot in your face or take you into the post or blow by you off the dribble," Ellenson said.
"I've just been working on my speed and quickness and I'm just showcasing it because I haven't really been able to show people that I have handles," he said.
Through 12 EYBL games, Ellenson is averaging 17.2 points, and 8.8 rebounds, including a convincing 24-point, 12-rebound performance against the elite 2015 post duo of Ivan Rabb and Stephen Zimmerman to close out last weekend in Hampton.
UNC assistant coach C.B. McGrath oversaw the recruitment during the past year, before Roy Williams visited Ellenson at his school on March 5, and the Tar Heel head coach then logged multiple evaluation viewings at EYBL Sacramento last month.
North Carolina joins a long list of offering schools, including Duke, Iowa State, Marquette, Michigan State and Wisconsin (where his father played).
"I want to go to a school that gets guys to the (NBA) because that's my main goal," Ellenson said.
* EYBL Takeout: Henry Ellenson
* Henry Ellenson Profile