Karissa Vacker: Karissa Vacker. Actress: How I Met Your Mother. Karissa Vacker graduated with her BFA from Southern Methodist University in her home state of Texas and went off to perform lead roles in regional theaters across the country. After settling in Chicago for a time and realizing winter is a thing, she made her way to Los Angeles. Television credits include How I Met Your Mother, Castle, Chuck, and Days of...
Known For: How I Met Your Mother (Holly), Someone Marry Barry (Juliet), Termite: The Walls Have Eyes (Mila), Distortion (Melissa Baker)