William Mandara Jr., AIA

Chief Executive Officer

Principal Bill Mandara comes from a family in the business: both his father and grandfather were general contractors. During his teenage summers, at his father’s job sites, he got the most thankless tasks. In retrospect, it was a great way to instill understanding and respect for the profession. It was also a not-so-subtle hint from his father that he should be thinking about architecture school instead.

Today, Bill heads our New York architecture studio, where he spends his time leading much of our efforts in new building design and the adaptive reuse of existing buildings, such as our work on 125 West 25th Street and 575 Lexington Avenue in New York City. He’s no stranger to interiors work, either, having served as Project Manager for our stylish headquarters build-out for Peloton.

He had been at TSC Design for five years when the firm’s assets were purchased by Mancini•Duffy in 2011, whereupon he was named a Senior Associate. He was later named a Principal in 2014, became an owner of the firm in 2017, and named Chief Executive Officer in 2018.

Throughout his career here, Bill’s believed in having a consistency of vision and of values: that we should never put ourselves or our vision ahead of the client’s. This consistency lets us respond to our clients quickly, with clarity and authority.

Bill lives with his wife and two children in Paramus, New Jersey.


Do you have any hidden talents?

Music. I played drums in a cover band in the early- and mid-90’s throughout New Jersey.  I currently write and record my own music in my home studio, playing all of the instruments and getting some vocal help from my son.  I’ve released music which is available on Spotify, Apple Music etc, and have several upcoming releases planned.



What would Spotify say is your most-played track?

“Cypress Grove”—Clutch

What’s the best thing about working at Mancini Duffy?

Great clients and co-workers. Before Mancini Duffy, I spent many years dreading going to work every Sunday night. I love that we’ve created an environment without roaming ogres, unlike most architectural offices.

Best advice you’ve ever received?

Don’t send emails when you’re angry. I wish I heeded this advice earlier in my career.

What’s one accomplishment you’re most proud of?

Watching my two sons grow into remarkable young men.

Any other interesting fact about you?

I’ve seen Rush about 26 times since 1987—at least once on every tour in the New York metro area.

William's Featured Work

125 West 25th Street Building Repositioning

43TEN 23rd Street Building Repositioning

575 lexington

575 Lexington Avenue Lobby Renovation

The New Dolan Family Science, Technology & Research Center at Chaminade High School

Dolan Family Science, Technology, and Research Center

Veria Ayurvedic Wellness Center Master Plan

Guardian Life Insurance at Bell Works

Washington Heights Residential Development

Long Island City Building Repositioning Study

TSX Broadway in Times Square

Bringing On-Site 3D Printing to Architecture

Exterior view of the proposed Silicon Alley office building

Silicon Alley Building Development Study

Utilizing Tech for Hyper-Customized Design & Installation Efficiencies

Rendering of the new lobby from the building renovation of 888 Broadway

888 Broadway Building Renovation

Rendering of the proposed exterior of 4 Gateway Center as part of the building renovation study

4 Gateway Center Renovation Study

Aerial View of Brooklyn Army Terminal

Brooklyn Army Terminal: Phase V Renovation

Exterior rendering of 114 East 25th Street before Building Renovation

Renovating 114 East 25th Street

Hero rendering of 541 West 21st Street Building Repositioning

541 West 21st Street Building Repositioning

Employee pantry and all-hands space for the new Global Consumer Products company office

Global Consumer Products Company New Offices

Brooklyn’s 240 Broadway

Modernizing an Onyx Equities Office Building

Green Roof Amenity at 701 Westchester Avenue

3535 Surf Avenue: Three-Tower Beachfront Development

5000 Richmond Street

Con Edison

Con Edison’s New York Headquarters

Tulfra Realty

Tulfra Realty Ground-Up Self Storage Facility

666 Passaic Avenue – Tulfra Realty

Stro Companies

Stro Companies’ New Renovations

SoHo Farmhouse

Expanding Under Armour’s Women’s Apparel Group

National Basketball Players Association

Kellenberg Memorial Labs Renovation

440 Elizabeth Ave

New Self-Storage Tower at 615 West 46th Street


Developing the Prologis Distribution Center

Lackland Self Storage


HANC Education Center

HANC Early Childhood Center


Tempo by Hilton Times Square

TSX Stage