Martin Sheen President Josiah "Jed" Bartlet Actor Bradley Whitford Dep. Chief of Staff Josh Lyman Actor John Spencer Chief of Staff Leo McGarry Actor Richard Schiff Communications Dir. Toby Ziegler Actor Allison Janney Press Secretary Claudia Jean "C.J." Cregg Actor Dulé Hill Charlie Young Actor Janel Moloney Donna Moss Actor Stockard Channing Abigail "Abbey" Bartlet Actor Matthew Perry Joe Quincy Guest Star Steven Culp Speaker of the House Jeff Haffley Guest Star Milo O'Shea Chief Justice Roy Ashland Guest Star Michael Hyatt Angela Blake Guest Star Kathrin Lautner Diane Mathers Guest Star Joshua Malina Will Bailey Guest Star NiCole Robinson Margaret Guest Star Elisabeth Moss Zoey Bartlet Guest Star Gary Cole Vice President Bob Russell Guest Star H. Richard Greene Senator Robert Royce Guest Star John Wells Executive Producer