Rob Lowe Sam Seaborn Actor 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 John Amos Percy Fitzwallace Actor Mark Harmon Agent Simon Donovan Guest Star Ian McShane Russian Negotiator Nikolai Ivanovich Guest Star Peter Scolari Antares CEO Jake Kimball Guest Star Michael O'Neill Secret Service Agent Ron Butterfield Guest Star Gregory Itzin State Department Representative Guest Star Bill Cobbs Alan Tatum Guest Star Svetlana Efremova Ludmila Koss Guest Star George Tasudis Russian Negotiator George Kazlovsky Guest Star Renee Estevez Nancy Guest Star Kim Webster Ginger Guest Star Kris Murphy Katie Witt Guest Star Aaron Sorkin Executive Producer Thomas Schlamme Executive Producer John Wells Executive Producer Paul Redford Producer Michael Hissrich Producer Kristin Harms Producer Llewellyn Wells Producer Alex Graves Director