Graduated from Cherry Creek High School.
Swam for the Colorado Stars and was coached by Todd Schmitz.
Was a state champion in the 100 breaststroke.
Received All-America awards in the 100 breaststroke, 100 freestyle and on the 100 medley relay.
Helped set the state record in the 200 medley relay.
Born November 19, 1994.
Son of Lyle and Sarah Mattern.
His sister, Jordan, is a junior for the Lady Bulldogs.
Majoring in Accounting.
100 Freestyle 46.47 13 CHSAA 5A Boys State
100 Breaststroke 56.62 13 CHSAA 5A Boys State