Marcus Wallace was 20 when he first saw his birth certificate. It named a woman he never met as “mother.” Curious, he stepped into the New York Public Library to look for clues — and got the shock of his life.
A library worker found a 1985 newspaper story on Dorothea Ballas, a 21-year-old student at Fairleigh Dickinson University in Teaneck, NJ. Ballas had given birth in her dorm room, put the newborn in a trash bag, knotted the top and dropped it in a dumpster behind a gas station, leaving the boy to suffocate or freeze in 20-degree temperatures.
“I broke down. I got on the subway and cried all the way from 42nd Street to Flatbush Avenue,” said Wallace, now 31 and ­living in Brooklyn.
“I had a lot of whys. What was wrong with me? Why me?”
The discovery spurred years of roller-coaster emotions. After two debilitating strokes in one year, …