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 Matthew Perry Joe Quincy Guest Star Willie Gault Agent Madsen Guest Star Peter James Smith Ed Guest Star Lily Tomlin Deborah Fiderer Guest Star NiCole Robinson Margaret Guest Star Michael O'Neill Secret Service Agent Ron Butterfield Guest Star Elisabeth Moss Zoey Bartlet Guest Star Joshua Malina Will Bailey Guest Star Renee Estevez Nancy Guest Star Aaron Sorkin Executive Producer, Writer Thomas Schlamme Executive Producer John Wells Executive Producer Neal Ahern Jr. Producer Paul Redford Producer Kristin Harms Producer Llewellyn Wells Producer Christopher Misiano Director