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 Stockard Channing Abigail "Abbey" Bartlet Actor Mary-Louise Parker Amy Gardner Guest Star Sam Lloyd Bob Engler Guest Star NiCole Robinson Margaret Guest Star Renee Estevez Nancy Guest Star Devika Parikh Bonnie Guest Star Kim Webster Ginger Guest Star Aaron Sorkin Executive Producer, Writer Thomas Schlamme Executive Producer John Wells Executive Producer Michael Hissrich Producer Alex Graves Producer, Director Kristin Harms Producer Llewellyn Wells Producer Kevin Falls Writer