A: I believe you are referring to Gilad Pellaeon (I think I actually spelled his name right!), captain of the Imperial Star Destroyer Chimaera (I think I spelled that right too). He became captain after assuming command when the previous captain was killed during the battle. He served under Thrawn, Daala, and others. He becomes Admiral/Supreme Commander of the Imperial Fleet when Daala was defeated and steps down as Admiral.
I especially like his participation in the New Jedi Order series.
Q: Name all the Super Star Destroyers in Star Wars (I can remember 5 <.<).
Bonus to name all if there is more than 5...