THR's Women in Entertainment 2012: Power 100

The daughter of and likely heir to 89-year-old Sumner Redstone, who controls both Viacom and CBS, she is in the mix with Viacom CEO Philippe Dauman and CBS Corp.'s Leslie Moonves to take over for her father, positioning her to determine the future of two major Hollywood players. The 58-year-old also spends much of her time on Advancit Capital, an early-stage investor in media, entertainment and technology.

Who gave me my first big break: I was practicing law, getting my M.A. in social work and raising three kids. My father thought I didn't have enough to do, so he suggested I work in the family business two days a week.

When I leave work each day, I can't wait to: Take a long walk outside or get on the elliptical machine.

Favorite way to unwind on the weekend: Go to the Cinema DeLux Theater at Legacy Place [in Dedham, Mass., where National Amusements, of which she is president, is based] and sample martinis and great food while watching a movie.

My indulgence: Anything chocolate, especially the chips that come in a bag and can be eaten 24/7.

Can't get through my workday without: Heating my coffee in the microwave 1,263 times.

Most surprising song on my iPod: "Save the World" by Swedish House Mafia.

Totally starstruck around Tom Brady and the New England Patriots.

What I'd tell my 22-year-old self about working in Hollywood: "Know what's real and what isn't."

Proudest moment this year: Being there when my grandson was born and hearing his first cry.

Click here to read THR's complete Women in Entertainment list.