William is the great grandson of Léopold Louis-Dreyfus, founder of Louis Dreyfus Group. The extended Louis-Dreyfus family's net worth was estimated at $2.9 billion by Forbes in 2004.

Louis-Dreyfus was chairman of the Poetry Society of America from 1998-2008. He is also a poet who has had poems published in publications such as The Hudson Review.

Julia Scarlett Elizabeth Louis-Dreyfus is an American actress and comedienne, well known for her roles in the sitcoms Seinfeld and The New Adventures of Old Christine.

Louis-Dreyfus has received two Emmy Awards, a Golden Globe Award and five Screen Actors Guild Awards.

She has a total of 12 Emmy Award nominations — seven for supporting actress in a comedy series for Seinfeld, and five for lead actress in a comedy series for The New Adventures of Old Christine.

In May 2010, Louis-Dreyfus received a star on the Hollywood Walk of Fame for her contribution to the broadcast television industry.