In Meldrath's Majestic Mansion (non-instanced): This is a named who appears in the "M.E.G." room of the mansion.
In Meldrath's Majestic Mansion (instanced): Findlewill makes a brief appearance in the "Brinda Sprockets" event and appears later in the "Meldrath the Malignant" event.
In the Valley of King Xorbb: Part of the raid event "Guardian of the Gate" (see this quest entry for information).