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 Elisabeth Moss Zoey Bartlet Actor Claire Yarlett Dr. Jenna Jacobs Guest Star Rebecca Creskoff Sarah Jordan Guest Star James Denton Tom Jordan Guest Star NiCole Robinson Margaret Guest Star Alfonso Freeman Andrew Mackintosh Guest Star Devika Parikh Bonnie Guest Star Kim Webster Ginger Guest Star Peter James Smith Ed Guest Star Aaron Sorkin Executive Producer, Writer Thomas Schlamme Executive Producer John Wells Executive Producer Kristin Harms Producer Llewellyn Wells Producer Alex Graves Director