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 Joshua Malina Will Bailey Actor John Amos Percy Fitzwallace Guest Star Jason Isaacs Colin Ayres Guest Star Terry O'Quinn General Nicholas Alexander Guest Star Kathleen York Andrea Wyatt Guest Star Ryan Cutrona CIA Director George Rollie Guest Star Ron Canada Under Secretary of State Theodore Barrow Guest Star Steve Ryan Secretary of Defense Miles Hutchinson Guest Star Kris Murphy Katie Witt Guest Star Mary McCormack Kate Harper Guest Star John Wells Executive Producer