She appeared simultaneously in a recurring role on The Sopranos as Tony Soprano's next door neighbor, Jeannie Cusamano, and as her twin sister, Joan from 1999 to 2007.[8] Additionally, on television, Santiago guest-starred on Law & Order in the 1992 episode "Prince of Darkness" (episode 3.8) and in the 2004 episode "Veteran's Day" (episode 14.15).