Huh. I wonder which Chief Justice has sworn in the most presidents.
There have been a couple of periods where a number of single-terms happened in succession, so I imagine probably at some point in either the early 19th or 20th centuries.
# of presidents first sworn in by each CJOTUS:
Jay 1
Rutledge 0
Ellsworth 1
Marshall 5
Taney 9
Chase 2
Waite 4
Fuller 4
White 2
Taft 2
Hughes 1
Stone 1
Vinson 1
Warren 3
Burger 3
Rehnquist 3
Roberts 3
It's Taney.
EDIT: I forgot that it was possible for Presidents to be sworn in by judges besides the CJOTUS. I had Taney at 9 because 9 presidents took office when he was in the job.
