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 Stockard Channing Abigail "Abbey" Bartlet Actor Janel Moloney Donna Moss Actor John Amos Percy Fitzwallace Actor Ron Silver Bruno Gianelli Guest Star Anna Deavere Smith Nancy McNally Guest Star NiCole Robinson Margaret Guest Star Renee Estevez Nancy Guest Star Thomas Kopache Assistant Secretary of State Bob Slatterly Guest Star Devika Parikh Bonnie Guest Star Kim Webster Ginger Guest Star Kris Murphy Katie Witt Guest Star Peter James Smith Ed Guest Star Mary-Louise Parker Actor Aaron Sorkin Executive Producer, Writer Thomas Schlamme Executive Producer, Director John Wells Executive Producer Michael Hissrich Producer Paul Redford Producer Alex Graves Producer, Director Kristin Harms Producer Llewellyn Wells Producer Christopher Misiano Director Eli Attie Writer Allison Abner Writer David Nutter Director Kevin Falls Writer Debora Cahn Writer Vincent Misiano Director Jeremy Kagan Director Josh Singer Writer