Willem van der Berg (born John William Comstock II; 24 June, 1978) was a Canadian-born pure-blood Dutch wizard and Auror. Born into the famous Comstock wizarding family, Willem was the second-youngest child of William Hale Comstock and his second wife; Elizabeth (née MacDonald), as well as the younger brother of Zachary Hale Comstock and elder brother of George Cornelius Comstock. He attended Ilvermorny School of Witchcraft and Wizardry from 1989 to 1996 as part of house Thunderbird.