Betterment new ad campaign -- currently only airing in the New York market -- features Billions star Maggie Siff. : Advisors beware, your favorite hedgie shrink––errr performance coach–-Wendy Rhoades has down-shifted from ultra-high net worth clientele to the mass affluent market (could your clients be next). Actually, the actress, Maggie Siff who plays the in-house psychologist for fictional hedge fund Axe Capital on the hit Showtime series Billions, is now starring in the new role of spokeswoman for automated investment service Betterment. Visionaries. Revolutionaries. Mavericks. They’re the people, the companies, who can disrupt entire industries.