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 McGee, Timothy McGee 's paraplegic wife on NCIS.
who plays alex in the big bang theory
Margo Cathleen Harshman