Jillian grew up in Middletown, Pennsylvania very near to the birthplace of Hershey's chocolate. After studying journalism at Villanova University, Jillian attended the two-year conservatory program at the American Academy of Dramatic Arts in New York City. She's also worked extensively as an improviser at the Upright Citizens Brigade.

Jillian most recently wrapped Green River Killer, a true crime feature opposite David Arquette and Vincent Kartheiser, set for release in late 2026, and Baby, You're A Star, an upcoming drama with scenes opposite Tyga and Apollonia.

Other credits include Sinister Assistant (Tubi Originals), This Is Us (NBC), Give Me An A (XYZ Films), and La Ciguapa Siempre (Netflix). She voices recurring characters on the Gen-Z breakout hit “The Royals of Malibu” (#1 Charting Fiction Podcast on Audible, Apple, & Spotify) and “Dragon Age: Vows and Vengeance,” the TribecaX award-winning audio drama based on the video game franchise. She's also been featured in several national commercials for Armor All, Carl's Jr., Hasbro, and The General.