Marg Helgenberger, born November 16, is a great actress. Her hard wok and perserverance extends to the big screne as well. Marg is mainly known for her acting on CSI, but has been in a number of hit movies such as Mr.Brooks, Species, Fire Down Below, and In Good Company. Marg is a very talented actress and does vry well with playing her parts. Marg plays Catherine Willows on the hit tv show CSI and many people are finding them selves hooked on her good looks and edgy attitude. Marg's refreshing personality and aproch to acting makes her one of the good guys.