As a junior Mann collected 56 tackles and five sacks. He reported a 4.8 mark in the 40-yard dash. Mann was one of the stars on the Valor Christian High School team and was part of a defense which not only won a state championship in their first year playing at the 4A level, but also was featured on a unit that allowed fewer than 10 points a game last season. The Eagles finished 12-3 in 2010 and were also state champions in 2009, their last campaign as a 3A school.
Mann was recruited by linebackers coach Trent Bray and defensive line coach Scott Brown.
"Coach Brown said he likes my quickness and speed off the edge," Mann commented in a previous interview, "and also my effort because I never give up on any play. He sees me a good pass rusher with good hands and good technique.
"I would like to get stronger and bigger and that's something I can do in the weight room. I would like to work more on more run defense and my technique."
Mann indicated that he did follow the Sun Devils last year and was impressed by their defense.
"I really like their 4-3 scheme and I think that I would fit in that type of style," Mann pointed out. "I like how aggressively and fast they played and in my opinion they are one of the best defenses in the Pac-12."