Summer Glau Biography Summer Lyn Glau was born on July 24, 1981, is an American actress & dancer, known for playing River Tam in the science fiction series Firefly & follow-up movie Serenity, & for playing Cameron in the series Terminator: The Sarah Connor Chronicles. Glau was born in San Antonio, Texas, where she grew up w/ her two younger sisters. She is of Scots-Irish & Germa... more.