Harry Potter and the Order of the Phoenix
Perkins is Mr. Weasley's colleague at the Misuse of Muggle Artifacts office. He is a "stooped, timid-looking old wizard with fluffy white hair" (7.126). He's the one who tells Mr. Weasley and Harry that Harry's hearing has been unexpectedly rescheduled and relocated. It's thanks to Perkins that Harry doesn't miss his hearing entirely.