Alyson was born on March 24, 1974, in Washington D.C.
Alyson, as everyone knows, played Willow Rosenberg for seven years on Buffy the Vampire Slayer. Then she guest-starred in three episodes of Veronica Mars as Trina Echolls. After that she found a home on the sitcom How I Met Your Mother as Lily Aldrin. But before Buffy she was in many TV shows in guest-roles. She also starred in three American Pie movies.