Union VI Corps Staff?

[JeffBrooks]

Does anyone have any information on the officers who made up the staff of the VI Corps during the latter stages of the Petersburg Campaign and during the Appomattox Campaign? I know that Arthur McClellan (the brother of the more famous George) was on Wright's staff during this time, but I can't seem to find out anything else. In particular, who was the corps chief-of-staff?

Thanks!