He received 34 scholarships worth $1.3 million - enough to get his bachelor's, his master's, and his doctorate, plus cover his living expenses with some left over to invest.
Now, Gray - since dubbed "the Million Dollar Scholar" - has found a way to help other teens find scholarship money. He and two associates have developed a mobile app called Scholly - shorthand for "scholarships" - for both the iPhone and Android.
The app has been available for only about a month, but several thousand downloads have sold. Gray and his colleagues decided to keep the price at 99 cents because their intent is more public service than profit.
All proceeds at this point are going back into the company, said Nick Pirollo, 23, one of Gray's partners. He is a computer and electrical engineering major from Washington Township who graduated Friday. He updates the app and manages the website Myscholly.com.
As a student at a magnet high school in Birmingham, Gray distinguished himself early on. He graduated with a 3.9 GPA while leading the local Bible club and running his nonprofit, Genesis, which organized volunteer opportunities for students.
He wanted to apply to Harvard and other top schools, but could not afford the application fees.
His guidance counselor suggested he apply for six scholarships. He got all of them, but knew he needed more. He scanned hundreds of websites, poring through criteria. Many scholarships had narrowly defined qualifications that he didn't meet: "It was frustrating."
But many looked for top-notch academics combined with leadership and community service. Gray had all three.
"I had 600 volunteer hours," he said. "And because I started a nonprofit, that made me stand out."
Gray's biggest coup was the Gates Millennium Scholarship, which covers tuition and room and board from a bachelor's to a doctorate. A $20,000 scholarship from Coca-Cola followed, and fortuitously put him in touch with Bryson Alef, a rising senior at Amherst College, his other partner on the Scholly app. He also received a $20,000 Horatio Alger Scholarship and the $10,000 Axa Achievement Scholarship.
Smaller awards came from Walmart and Lowe's. And they just kept coming.
"My mom was elated. I did a little jumping around," Gray said.
Gray, an entrepreneurship major at Drexel, has used the money for tuition, room and board, supplies at the Apple store, travel for interviews, clothing, and other needs.
He has appeared at national conferences and in the media, including U.S. News and World Report. As a result, hundreds of students and parents have e-mailed and called for advice. Working with Mayor Nutter's office on education, he has also advised students at Philadelphia public high schools.
"That's what inspired me to make the app," he said. "It was taking hours of my day trying to help. It just became too much."
Gray has uploaded 500 scholarships on the app and continues to add more. They are sorted by eight areas: state, race, GPA, gender, need/merit, grade (high school or college), major, and miscellaneous. Students can find suitable scholarships and create a spreadsheet. Gray also has uploaded several of his winning scholarship essays.
The app is geared to both high school and college students, who can qualify even though they are already in school, Gray said.
After graduation, Pirollo will continue working with Gray and also start a job with Vistaprint, a business card company.
Gray, who has two more years at Drexel, wants to make it easier for his siblings than it was for him.
"I'm trying to save up to put them in a better environment," he said, aiming to get them into a private school by fifth grade.
As for his career plans, he has the goal of a true entrepreneur: "Ideally not to have to get a job when I graduate."
Contact Susan Snyder at 215-854-4693 or firstname.lastname@example.org or follow on Twitter @ssnyderinq. Read her blog at http://www.philly.com/philly/blogs/campus_inq