Margo Cathleen Harshman (born March 4, 1986) is an American actress known for her role as Tawny Dean on the Disney Channel series Even Stevens. She is also known for her role on The Big Bang Theory as Sheldon Cooper's assistant, Alex Jensen, and as Delilah Fielding on NCIS.
Margo Harshman was born in San Diego, California. She has two older sisters, one older brother and one younger brother. Harshman lived in La Costa, San Diego County, California and attended school there until she was 12, after which she moved to Orange County, California. There she finished the rest of her eduction, first at Hewes Middle School and then at Foothill High School. Harshman now lives in Los Angeles.