His graduation with honors capped a dozen years of studies, including readings in ancient Latin and Greek.

"This is a man with great pride, whether he's doing custodial work or academics," said Peter Awn, dean of Columbia's School of General Studies and professor of Islamic studies. "He is immensely humble and grateful, but he's one individual who makes his own future."

Filipaj was accepted at Columbia after first learning English; his mother tongue is Albanian.

For Filipaj, the degree comes after years of studying late into the night in his Bronx apartment, where he'd open his books after a 2:30-11 p.m. shift as a "heavy cleaner" — his job title. Before exam time or to finish a paper, he'd pull all-nighters, then go to class in the morning and then to work.

On Sunday morning in the sun-drenched grassy quad of Columbia's Manhattan campus, Filipaj flashed a huge smile and a thumbs-up as he walked off the podium after a handshake from Columbia President Lee Bollinger.

Later, Filipaj got a big hug from his boss, Donald Schlosser, Columbia's assistant vice president for campus operations.

Bollinger presided over a ceremony in which General Studies students received their graduation certificates. They also can attend Wednesday's commencement of all Columbia graduates, most of whom are in their 20s.

Filipaj wasn't much older in 1992 when he left Montenegro, then a Yugoslav republic facing a brutal civil war.

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