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 Roger Rees Lord John Marbury Guest Star Elisabeth Moss Zoey Bartlet Guest Star John Diehl Claypool Guest Star James Hong Chinese Ambassador Guest Star Erick Avari Pakistani Ambassador Guest Star David Doty Military Officer Guest Star Clyde Kusatsu Joe Guest Star Iqbal Theba Indian Ambassador Guest Star Ryan Cutrona CIA Director George Rollie Guest Star Ralph Meyering Jr. Tom Guest Star Peter James Smith Ed Guest Star Gary Carlos Cervantes Bobby Guest Star Kathryn Joosten Mrs. Landingham Guest Star Aaron Sorkin Executive Producer, Writer Thomas Schlamme Executive Producer John Wells Executive Producer Kristin Harms Producer Llewellyn Wells Producer Patrick Caddell Writer Kevin Rodney Sullivan Director