Gary Megson transformed the club on the pitch, from nearly dropping into league 1 to winning automatic promotion to the Premier League.
Roy Hodgson took a side which seemed content to yo-yo, and established it as a mid-table premier league team.
Jeremy Peace changed the face of the club off the pitch, building on the work of Paul Thompson to change the way the club was run.
Dan Ashworth established the scouting and transfer methods which consistently improved the playing side (although with a few duds).
Chris Brunt has nearly done ten years at the club, creating and scoring a number of goals during the time, and even (contentiously) captaining us for several years.
Odemwingie scored the goals that kept us up. Super Bob scored the goals that kept us up, then got us up. As good as Phillips was (and he's one of my Albion heroes), there are more worthy nominations.