Many cast members have been Emmy-nominated for their work on "The West Wing" but have not won, including Martin Sheen—who was nominated each year for all seven seasons of the series without receiving the award—as well as Janel Moloney, who was nominated twice, and Dulé Hill, Rob Lowe, and Mary-Louise Parker, who were all nominated once. Matthew Perry, Oliver Platt, Ron Silver, Tim Matheson, and Mark Harmon have also received Emmy nominations for guest starring on the show.