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 Amos Percy Fitzwallace Guest Star Elisabeth Moss Zoey Bartlet Guest Star Timothy Busfield Danny Concannon Guest Star Suzy Nakamura Cathy Guest Star Renee Estevez Nancy Guest Star Kathryn Joosten Mrs. Landingham Guest Star NiCole Robinson Margaret Guest Star Kim Webster Kim Guest Star Devika Parikh Bonnie Guest Star Kris Murphy Katie Witt Guest Star Peter James Smith Ed Guest Star Aaron Sorkin Executive Producer, Writer Thomas Schlamme Executive Producer, Director John Wells Executive Producer Kristin Harms Producer Llewellyn Wells Producer Arlene Sanford Director Ron Osborn Writer Lawrence O'Donnell Writer Patrick Caddell Writer Ken Olin Director Paul Redford Writer Christopher Misiano Director Anthony Drazan Director Marc Buckland Director Laura Innes Director Robert Berlinger Director Alan Taylor Director Bill D'Elia Director