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 Stockard Channing Abigail "Abbey" Bartlet Guest Star Elisabeth Moss Zoey Bartlet Guest Star Amy Aquino Becky Reeseman Guest Star Kathryn Joosten Mrs. Landingham Guest Star Kim Webster Ginger Guest Star Jorja Fox Agent Gina Toscano Guest Star Timothy Busfield Danny Concannon Guest Star Kris Murphy Katie Witt Guest Star Aaron Sorkin Executive Producer, Writer Thomas Schlamme Executive Producer John Wells Executive Producer Kristin Harms Producer Llewellyn Wells Producer Lawrence O'Donnell Writer Paul Redford Writer Ken Olin Director