And now there are three.
On Wednesday morning, Wendell Pritchett signed the oath that made him a member of the Philadelphia School Reform Commission, the mayor's office said tonight. 
The Rutgers-Camden chancellor, an appointee of Mayor Nutter, signed a document that read: "I, Wendell Pritchett, do solemnly swear that I will support, defend the Constitution of the United States, the Constitution of the Commonwealth of Pennsylvania and the Philadelphia Home Rule Charter as it applies to the School District of Philadelphia and that I will discharge the duties of my office with fidelity."
Pritchett will attend his first SRC meeting next Wednesday. He makes the third member of the commission, joining Denise McGregor Armbrister and Joseph Dworetzky.
In this case, three really is the magic number - it represents a quorum; in order for any resolution to pass next week, all three commissioners must vote to approve it. 
Two SRC members - Chairman Robert Archie and Johnny Irizarry - resigned last week; another, Pedro Ramos, who's widely expected to be named chairman, awaits confirmation by the state Senate.  Pritchett, as a mayoral appointee, did not require confirmation.
The commission's fifth seat, another mayoral pick, is open.
In the past, SRC members have taken their oaths in public, with pomp and circumstance, but there's clearly urgency to get Pritchett in place, and legally, all that's required to seat an SRC member is a signature.