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 Joshua Malina Will Bailey Actor John Amos Percy Fitzwallace Actor Mary-Louise Parker Amy Gardner Guest Star Christian Slater Lt. Cmdr. Jack Reese Guest Star Vyto Ruginis Mitch Guest Star Audrey Wasilewski Janice Trumbull Guest Star Renee Estevez Nancy Guest Star Kris Murphy Katie Witt Guest Star Mary McCormack Actor Alan Alda Actor Lily Tomlin Actor Moira Kelly Actor Jimmy Smits Actor Janeane Garofalo Actor Teri Polo Actor Kristin Chenoweth Actor Aaron Sorkin Executive Producer Thomas Schlamme Executive Producer John Wells Executive Producer Neal Ahern Jr. Producer Paul Redford Producer Kristin Harms Producer Llewellyn Wells Producer John David Coles Director Alex Graves Director Christopher Misiano Director Debora Cahn Writer Josh Singer Writer