Meet the Team

About Katharine Jessica Interior Designer

We believe in the power of interior design.

And not just in well-crafted function and lovely reveals—we deliver design experiences built to change the way you live.

Founded in 2003, our firm arrives armed with experience, precise process—and a reputation built almost exclusively on client referrals.

Every project is custom, every outcome is extraordinarily liveable, and every aspect will be a reflection of your own enduring style.

Katharine Jessica Interior Designer

Katharine Posillico McGowan
Principal Designer, Founder

Katharine has immersed herself in the design world for over 20 years. She began her career as a fashion buyer and a product designer, before completing her degree at the New York School of Interior Design. She launched Katharine Jessica Interior Design in 2003.

Forté. Katharine sees the magic in every detail. She has mastered ways to create subtle depth, texture, and flow by lavishing attention on those small accents that make all the difference.

About Katharine Jessica Interior Designer

A Few Features & Accolades

  • Katharine is currently serving as President, ASID New York Metro
  • Served as Long Island Liaison for ASID New York Metro – 2019
  • Recognized as one of Newsday’s “All-Star Designers” – 2015
  • Featured in Hampton Designer Showhouse – 2015 & 2018
  • Designed a room for “Project Design” for The Ronald McDonald House of L.I. – 2014
Katharine Jessica Interior Design Long Island Ny

Charities and Volunteer Work

Jacquelyn Project Manager Kj Id

Jacquelyn Lagravinese Eberhardt
Project Manager

After earning her degree at NYIT, Jacquelyn joined our firm in 2012. She brings with her a wide range of artistic vision and mechanical proficiency—from CAD to commissioning custom cabinetry.

Forté. Jacquelyn can dream it and make it happen. Creatively ambidextrous, she can flip from wild imagination to deeply technical to make sure our clients get the best of everything.

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