Mandley was a two-time first team All-America and two-time honorable mention All-America at NAU. He joins fellow Hall of Famer Harold Smith as the only NAU football player to receive first team All-Big Sky honors for three years. He was also selected as the Big Sky Athlete of the Week. Mandley was selected in second round by the Detroit Lions in 1984. He played in the NFL for eight years. At one time he held the NCAA I-AA career record for all-purpose yards with 5,925, a mark which still stands as the NAU and Big Sky Conference record at the time of his induction. In addition to career all-purpose yards, Mandley also established NAU career records with 1,988 kick-off return yards, 901 punt return yards, 3 punt returns for touchdowns, and 26 total touchdowns, all records which still stand at the time of his induction. In addition, in 1982 he established a season mark with 1,979 all-purpose yards and a game record of most receptions with 12-both marks which also stand at the time of his induction. Mandley also held the second position in NAU history with 149 career pass receptions, 2,599 career receiving yards, 18 career receiving touchdowns, and 11.2 punt return average when he was inducted. He led the Jacks in kick-off returns all four years he played. He also led them in all-purpose yardage, punt returns, and receiving three of the four years he played. In addition to his record breaking football career, Mandley also ran sprints for the NAU track team, including the 400 meter relay.