Schleif was a three-sport athlete, excelling in football under coach Bob Curtis. He competed in Track & Field under Bill Ianacelli and basketball under Chuck Taylor. Schleif was a standout wide receiver that rolled up numbers in a running-dominated era that remain impressive today. In 1972, Schleif was an All-Middle Atlantic Conference selection that helped the Diplomats to a 9-0 record and the Lambert Trophy. In only three seasons, Schleif piled up 1,635 receiving yards. A school record at the time, it remained seventh on the career chart at the time of his selection, nearly 40 years after his graduation. His 114 career receptions were also a record when he graduated and were sixth on the career charts when he was chosen for the hall. Ten of those catches ended in his opponents' end zone, which was tied for third on the career list at the end of his career. In 1970, he ranked sixth in NCAA Division III in receiving yards. He caught 55 passes in 8 games for 700 yards that season.