What makes this so remarkable, is that the senior hasn't walked in years.
Derek DeGregorio was fiercely determined to take these steps.
Eyewitness News Reporter Michelle Charlesworth posted video of him training for the big moment on social media.
"If you want something never give up," Derek said.
Derek showed off walking at rehearsal for Princeton High School graduation.
Derek will walk to get his diploma in an iron-man type exoskeleton borrowed for the occasion.
He practiced with his brother Aaron, who is also graduating.
Derek is borrowing the exoskeleton to steady him and make impossible walking possible.
"It's weird to see him stand upright, we never see that!" said Steve DeGregorio, Derek's father. "Yes it is. It is just overwhelming"
Derek's dad Steve is a football coach.
"He is the toughest individual I know," Steve said. "True grit is what he has, compassion and perseverance, that's what he has, that's Derek."
"We don't have the word 'no' in our vocabulary," said Nadia DeGregorio, Derek's mother. "Whatever you need to get done, you do what you need to get there."
Derek has Ataxia Telangiectasia, a degenerative neurological disease.
Until age 12, he had been misdiagnosed with Cerebral Palsy, but he still competed in flag football and Taekwondo.
He's been in a wheelchair through high school, which brings us to his graduation day.
How does walking make him feel? He says "tall" and also proud of himself.
"Because I can't do it normally," Derek said.
"Because you can't normally and you have been practicing this?" Eyewitness News Reporter Michelle Charlesworth said.
"Yes," Derek said.
Of his parents he said, "They are the best. They don't hold me back."
His parents would add, it would be impossible to hold him back.