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 Ron Silver Bruno Gianelli Guest Star Gary Farmer Jack Lone Feather Guest Star Renee Estevez Nancy Guest Star NiCole Robinson Margaret Guest Star Georgina Lightning Maggie Morningstar Charles Guest Star Armando Pucci Alberto Fedrigotti Guest Star Jenny Gago Bernice Collette Guest Star Shashawnee Hall Russell Angler Guest Star David Hager DeKalb City DA Mark Farragut Guest Star Kim Webster Ginger Guest Star Aaron Sorkin Executive Producer, Writer Thomas Schlamme Executive Producer John Wells Executive Producer Michael Hissrich Producer Alex Graves Producer Kristin Harms Producer Llewellyn Wells Producer Allison Abner Writer Kevin Falls Writer Paris Barclay Director