Siebert, who replaces Jon Nedelcoff, has coached boys and girls basketball.
The Purgolders finished tied for third in the Big Eight Conference and reached the WIAA Division 1 sectional final.
McGann will replace Levi Massey, who took a job in Minocqua.
Stoughton's Brady Schipper, Madison La Follette's Tyra Turner named athletes of the year for 2017-18
Schipper was a standout in football, basketball and baseball, while Turner was a four-sport athlete: volleyball, gymnastics, softball and track and field. Schipper and Turner have each committed to the University of Wisconsin.
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