Tamsin Greig (born July 12, 1966) is a British actress known for her versatile performances in television and theatre. She gained fame for roles in comedies like 'Green Wing' as Dr. Caroline Todd and 'Black Books' as Fran Katzenjammer, as well as dramas such as 'The Essex Serpent' as Martha Kendall. Greig has also performed in Shakespearean plays, earning Olivier Award nominations. Her acting style is noted for its wit, nuance, and emotional depth, making her a beloved figure in British entertainment.