Martin Sheen President Josiah "Jed" Bartlet Actor John Spencer Chief of Staff Leo McGarry Actor Rob Lowe Sam Seaborn Actor Bradley Whitford Dep. Chief of Staff Josh Lyman Actor Richard Schiff Communications Dir. Toby Ziegler Actor Allison Janney Press Secretary Claudia Jean "C.J." Cregg Actor Moira Kelly Mandy Hampton Actor Dulé Hill Charlie Young Actor Janel Moloney Donna Moss Actor Marlee Matlin Joey Lucas Guest Star John de Lancie Al Kiefer Guest Star Kathleen York Andrea Wyatt Guest Star Kathryn Joosten Mrs. Landingham Guest Star NiCole Robinson Margaret Guest Star Devika Parikh Bonnie Guest Star Kim Webster Ginger Guest Star Suzy Nakamura Cathy Guest Star Bill O'Brien Kenny Thurman Guest Star Timothy Busfield Danny Concannon Guest Star Kris Murphy Katie Witt Guest Star Aaron Sorkin Executive Producer, Writer Thomas Schlamme Executive Producer John Wells Executive Producer Kristin Harms Producer Llewellyn Wells Producer Robert Berlinger Director