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 Timothy Busfield Danny Concannon Actor Elisabeth Moss Zoey Bartlet Actor Michael O'Neill Secret Service Agent Ron Butterfield Guest Star NiCole Robinson Margaret Guest Star Grace Zabriskie Isabel Guest Star Allen Garfield Roger Becker Guest Star Devika Parikh Bonnie Guest Star Kris Murphy Katie Witt Guest Star Chad McKnight Aide 5 Guest Star Aaron Sorkin Executive Producer Thomas Schlamme Director John Wells Executive Producer Kristin Harms Producer Llewellyn Wells Producer