After days of speculation, Richardson went public on Thursday and let it be known that he has indeed switched his commitment to the Men of Troy.
"After the relationships that you build it's kind of hard to de-commit, but it's worth it," Richardson said. "I feel like USC is two or three players away from having a great team.
"I went there, had a great experience and want to be part of the team."
The 6-4, 290-pound lineman was hosted on his recent visit by Armond Armstead and said he knew when he came out of the Coliseum tunnel that USC was a special place.
"Walking into the Coliseum, the hair stood up on my arms. It was a great feeling with all of the mystique of it," he said. "It just felt like I needed to be part of it. My gut instinct told me that I needed to be at USC."
Being a highly recruited player in high school and now out of College of the Sequoias, Richardson has heard all the pitches, and says that Ed Orgeron is one of the best recruiters that he has encountered.
"He is one of the best defensive line coaches and he is also one of the best recruiting coaches that I have talked to," he said. "He probably does some of the best recruiting. I have been in the recruiting game for a long time so I have asked all of the questions.
"It's not hard to see that Coach Orgeron and Coach Kiffin know what they are doing."
The elite prospect can't wait to get on campus and learn from Orgeron, who he believes will get him ready for a career in the NFL.
"When he told me his resume and I told him mine, we knew that it was the perfect fit for me," he said. "He showed me all of the other great defensive linemen that he has coached like Sedrick Ellis.
"They can have me NFL ready in two years. I just can't wait to get there."
Richardson plans to be back in Los Angeles later this month on an unofficial visit for USC's last home game of the season against Notre Dame.
He also plans to take an official visit to Cal.