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 Kathryn Joosten Mrs. Landingham Actor F. William Parker Rev. Al Caldwell Guest Star Annie Corley Mary Marsh Guest Star Deborah Hedwall Josephine McGarry Guest Star NiCole Robinson Margaret Guest Star Sam Anderson John LaSalle Guest Star Henry O Jhin Wei Guest Star Devika Parikh Bonnie Guest Star Kim Webster Ginger Guest Star Aaron Sorkin Executive Producer Thomas Schlamme Executive Producer John Wells Executive Producer Kristin Harms Producer Llewellyn Wells Producer Laura Innes Director