Southern Stampede coach Michael Stokes, who accompanied Gant on his visit, confirmed the news.
"Coach [Haith] watched a lot of his games," Stokes told Scout.com. "He's their type of kid and he just felt comfortable there. I said if that's what you want to do lets roll with it."
"His mom played a big role in it," he added. "She felt comfortable with the staff. She's a very spiritual lady and she felt like this is where he belonged and with the basketball it just fell into place."
Stokes said he visit to Missouri this weekend played a major part in the decision.
"I think it sealed it up," Stokes said. "I think coach Fuller did a lot of leg work. Coach Haith's personality is laid back and he's a basketball guy."
"There are certain coaches he couldn't thrive under and he felt like be could play for Haith," he added.
Gant is Missouri's second top 100 prospect to pledge in the 2014 class. He joins four-star wing Chris Sandifer to make up their current recruiting class.