|Affiliation||Hogwarts School of Witchcraft and Wizardry|
On the first of September in 2009, he befriended Violet Parkinson, Kai Chang and Teddy Lupin aboard the Hogwarts Express. The four agreed to remain friends through their schooling regardless of which Houses they joined. Dewey partook in the infamous Sorting of 2009, and was placed in Hufflepuff, where he roomed with Simon Norman, Edgar Hargrave, and Alduin Beauxjour.
In January of 2010, he was among the major reorganizers of the D.A.