Williamson, who lived in Winston-Salem when he was younger, played Pop Warner Football with McCalister.
"We knew each other when we were younger and we just really reconnected through the recruiting process," Williamson said.
Alex McCalister, a 6-5, 203-pound defensive prospect from Clemmons (N.C.) West Forsyth, is deciding between UNC, Florida and Georgia Tech.
"I'm just trying to give him that extra push, tell him why he should commit and why I committed," Williamson said. "I've told him that if he comes to Carolina he'll already have friends there and how it's a friendly atmosphere and the coaches are great."
Williamson and McCalister will also be in Chapel Hill on Saturday.
"The only coaches I've talked to [at UNC] are Coach Duggan and Coach [Marcus] Berry," Williamson said. "Saturday, I want to really talk to the other coaches. I've been talking to Coach Duggan and he's been answering my questions, so really I just want to meet the other coaches and bond."
Shortly after Larry Fedora was hired at UNC, Williamson lost his cell phone. He didn't receive a new cell phone until a couple of days before Christmas. That paired with Fedora's hectic schedule contributed to Williamson not hearing from any UNC representative until last week when Duggan called.
Since that initial call, Williamson and Duggan have remained in constant contact, including Duggan's visit to Jordan High School on Thursday.
"He talks to me about the 4-2-5 defense they're going to run," Williamson said. "Where they're going to use me at – the Will linebacker. He said he saw my highlight tape and saw I got a lot of interceptions, so he knows I can drop into coverage more than other linebackers. He said he's going to use that and my speed to his advantage.
"The Will [in the 4-2-5 defense] is on the weak-side and will cover receivers. The Will is more like a bigger, stronger safety-type."
Williamson is no stranger to the 4-2-5 defensive scheme.
"The defense is like what Jordan plays now," Williamson said. "So I'm cool with it. I know most of the plays and the responsibilities."
Through the few conversations he's had, Williamson has developed a favorable opinion of Duggan.
"When I talk to Coach Duggan, I can tell he has a good heart," Williamson said. "He told me he's going to help me on and off the field and after college. I like how it feels like a family, even though I'm still trying to get to know everybody. I just get a good vibe."