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 Elisabeth Moss Zoey Bartlet Guest Star Allison Smith Mallory O'Brien Guest Star Carl Lumbly Jeff Breckenridge Guest Star NiCole Robinson Margaret Guest Star Devika Parikh Bonnie Guest Star Kim Webster Ginger Guest Star Suzy Nakamura Cathy Guest Star Jorja Fox Agent Gina Toscano Guest Star Timothy Busfield Danny Concannon Guest Star Aaron Sorkin Executive Producer, Writer Thomas Schlamme Executive Producer John Wells Executive Producer Kristin Harms Producer Llewellyn Wells Producer Clark Johnson Director