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 Goodman Glenallen Walken Guest Star Shannon Marshall Randy Weathers Guest Star Mary-Louise Parker Amy Gardner Guest Star NiCole Robinson Margaret Guest Star Devika Parikh Bonnie Guest Star Kim Webster Ginger Guest Star John Amos Percy Fitzwallace Guest Star Anna Deavere Smith Nancy McNally Guest Star Michael O'Neill Secret Service Agent Ron Butterfield Guest Star Taye Diggs Secret Service Agent Wesley Guest Star Clark Gregg FBI Special Agent Michael Casper Guest Star Trent Ford Jean Paul Guest Star Kris Murphy Katie Witt Guest Star Joshua Malina Will Bailey Guest Star Aaron Sorkin Executive Producer, Writer Thomas Schlamme Executive Producer John Wells Executive Producer Neal Ahern Jr. Producer Paul Redford Producer Kristin Harms Producer Llewellyn Wells Producer Christopher Misiano Director