247Sports three-star player.
Hudl.com has video.
Scout.com four-star player.
Partial quote from a 01/29/17 article on Scout.com by Chad Simmons:
"Chatman is still waiting on his first SEC offer, but expect it to come soon. He is a prospect in the Peach State that is definitely on the rise. He is very strong, he plays with leverage, he is a high-motor kid on the field and he is one who could project as a five or three-technique on the next level.
He would like to commit this spring."
Chatman has 15 offers including from a number of Power Five schools. Besides UMass only Rutgers has offered from the Northeast.