Chief Warlock
From UnknowableWiki
The Chief Warlock of the Wizengamot is probably the wizard that oversees court procedures. Albus Dumbledore held this title for several years, until 1995; a discrediting campaign that the Ministry of Magic and the Daily Prophet carried out that year caused him to lose the position (OP5). Dumbledore was reinstated when the Ministry was forced to acknowledge Lord Voldemort's return to power (OP38), and presumably held the title until his death (HBP27).
In his obituary for Dumbledore, Elphias Doge praised the wisdom the late Chief Warlock had displayed in several judgments while he had occupied that position (DH2).

