Rob Lowe Sam Seaborn Actor Martin Sheen President Josiah "Jed" Bartlet Actor Bradley Whitford Dep. Chief of Staff Josh Lyman Actor John Spencer Chief of Staff Leo McGarry Actor Richard Schiff Communications Dir. Toby Ziegler Actor Allison Janney Press Secretary Claudia Jean "C.J." Cregg Actor Dulé Hill Charlie Young Actor Janel Moloney Donna Moss Actor Emily Procter Ainsley Hayes Actor Zakes Mokae President Nimbala Guest Star Michael Chinyamurindi Nimbala's Translator Guest Star Michael Cavanaugh Pharmaceutical Executive Guest Star Len Cariou Pharmaceutical Executive Guest Star Ted McGinley Mark Gottfried Guest Star NiCole Robinson Margaret Guest Star Sam Jaeger Bill Kelley Guest Star Tom Gallop Bruce Guest Star Kim Webster Ginger 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 Ken Olin Director