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 John Bedford Lloyd Lloyd Russell Guest Star Ruben Santiago-Hudson Morris Tolliver Guest Star Lisa Edelstein Laurie Guest Star Merrin Dungey Daisy Guest Star Renee Estevez Nancy Guest Star Suzy Nakamura Cathy Guest Star Tim Matheson Vice President John Hoynes Guest Star Kathryn Joosten Mrs. Landingham Guest Star NiCole Robinson Margaret Guest Star Peter James Smith Ed Guest Star Andy Umberger Stevie Guest Star Rose Rollins Suzanne Guest Star Aaron Sorkin Executive Producer, Writer Thomas Schlamme Executive Producer, Director John Wells Executive Producer Kristin Harms Producer Llewellyn Wells Producer