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 Karl Malden Father Thomas Cavanaugh Guest Star Noah Emmerich Bobby Zane Guest Star Devika Parikh Bonnie Guest Star Bill O'Brien Kenny Thurman Guest Star Renee Estevez Nancy Guest Star Aaron Sorkin Executive Producer, Writer Thomas Schlamme Executive Producer, Director John Wells Executive Producer Kristin Harms Producer Llewellyn Wells Producer