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 Mary-Louise Parker Amy Gardner Guest Star Anna Deavere Smith Nancy McNally Guest Star Christian Clemenson Evan Woodkirk Guest Star Dinah Lenney Mary Klein Guest Star Ty Burrell Tom Starks Guest Star Bradley White James Guest Star Bruce Kirby Barney Lang Guest Star Sid Conrad Ed Ramsey Guest Star Bill Erwin Ronald Cruikshank Guest Star Kim Webster Ginger Guest Star Kris Murphy Katie Witt Guest Star Peter James Smith Ed Guest Star Alex Graves Director Aaron Sorkin Executive Producer Thomas Schlamme Executive Producer John Wells Executive Producer Michael Hissrich Producer Kristin Harms Producer Llewellyn Wells Producer