Ninth Edition of the MPEP, Revision 10.2019, Last Revised in June 2020
2255 Who Reexamines [R-07.2015]
The examination will ordinarily be conducted by the same patent examiner who made the decision on whether the reexamination request should be granted. See MPEP § 2236.
However, if a petition under 37 CFR 1.515(c) is granted after an examiner's determination that found the request did not raise any SNQ, the reexamination will generally be conducted by another examiner. See MPEP § 2248.