About Gretchen Mol
Gretchen Mol is an American actress. She is known for her role as Gillian Darmody in the HBO series Boardwalk Empire (2010–2014). She also appeared in the films Rounders (1998), Celebrity (1998), The Thirteenth Floor (1999), The Notorious Bettie Page (2005) – in which she played the title character – 3:10 to Yuma (2007), and Manchester by the Sea (2016). Mol became involved with PMD after one of her cousins died from amyotrophic lateral sclerosis (familiarly known as "Lou Gehrig's Disease").
Biography source: Wikipedia. The profile adds birthday-specific historical context from the Celebs Birthday Today editorial database.