Here is the CRS report., via the NYTs. Here is Canning v. NLRB.
Indian law related (loosely speaking) appointments include:
Tadd Johnson
Chairperson, National Indian Gaming Commission
08/29/97
Montie R. Deer
Chair, National Indian Gaming Commission
11/13/98
Donald L. Fixico
Member, National Council on the Humanities
12/29/00
Sue Ellen Wooldridge
Solicitor, Department of the Interior
05/28/04
Peter Schaumber
Member, National Labor Relations Board
08/31/05