The 6-foot-5, 318-pound Randolph (N.J.) High offensive tackle took part in Saturday's Advanced Skills Camp, where he worked with offensive line coach Mac McWhorter, who was instrumental in Mahon's decision.
"It's great just to be able to (camp at Penn State) and focus on the important things of playing football. Working out with coach Mac is a great feeling. He's so intense, and he loves his job and he loves football. His enthusiasm is amazing."
In fact, Mahon said part of his recruiting pitch to uncommitted offensive linemen in the 2013 and 2014 classes focuses on McWhorter.
"I like to tell them my point of view and the reasons I committed," Mahon said. "Coach Mac is a big factor and I think it should be a big factor for them, too."
Mahon talks regularly with McWhorter, coach Bill O'Brien and assistant John Strollo, who recruits northern New Jersey.
Leading up to the camp, Mahon was anxious to get to camp. And when it was time to leave, he felt himself wanting to stay a log longer. He would be in position to graduate early and enroll in January, but the Randolph school district doesn't allow it.
So, Mahon knows he will have to wait a year to enroll.
"It takes a toll on me every day," he said. "Just coming up on (last) weekend takes a huge toll. You want to be up here, you want to start playing, but I have duties to my senior year and my football team, so I have to be a good captain and lead them to success and hopefully a state championship."
Mahon is planning a few more visits this summer, but most of his attention will be on working out and getting in shape for the season.
"Strength and conditioning is a big thing," he said. "I love to work out and I want to be the best I can be for the football team. I'm 318, but 310 is where I want to be."
Mahon then smiled and added, "I can play at 318, but I'd like to lose a couple of pounds for the ladies."