Marguerite H. Sullivan is a public affairs and communications specialist. She began her career as a reporter and columnist for Copley News Service, and then served as executive editor of The Washington Woman magazine from 1984 to 1986.

Ms. Sullivan moved into the political arena in 1986, as director of communications for the National Endowment for the Humanities. In 1991, she became part of the White House staff, where she was assistant to Vice President Dan Quayle in the administration of President George Bush (1989-1993) and chief of staff and press secretary to Marilyn Quayle, wife of the vice president. She subsequently worked in state government as a cabinet member and director of federal liaison for then New Jersey Governor Christine Todd Whitman.

During the 2000 U.S. presidential campaign, Ms. Sullivan was chief of staff and press secretary to Lynne Cheney, wife of Vice President Dick Cheney. She is currently vice president for communications and external affairs with the International Republican Institute, a private nonprofit organization dedicated to advancing democracy worldwide.