Karzon is one of the four heroes in Curse of Strahd, he is the parties' wizard.
Karzon grew up in Neverwinter, he displayed magical prowess from a young age and was trained by a visiting elf wizard called Gralkhan. When he came of age, Karzon stopped Gralkhan's nephew Nezznar from taking over the city of Phandalin and became a celebrated hero. After this, Karzon retired wealthily to the town of Eastwind.
Karzon respects authority, but is often prone to questioning it.