Breaking Ground


Volume 7 | Issue 1

Dear Readers,

Please enjoy this edition of Breaking Ground where we showcase our activities and projects over the winter months. I hope you all can join us at the Reading Phillies on Saturday, May 13 as tickets to the event are free!


Matthew E. Hilbush, PE

Founder, Mainstay Engineering Group, Inc.  


Brickworks, New York, NY

photo credit: Chris Cooper

Mainstay is proud to have provided structural design services for Brickworks' 16,000sqft design studio in New York City. It was especially rewarding to work with the beautiful Austral Venetian Glass Bricks to create the transparent façade, monumental glass brick clad staircase, and a very unique glass brick guard rail system.

The design includes two one-of-a-kind, first-time uses of solid venetian glass brick in the USA. The design team was tasked with the challenge of inventing new and creative ways to work with the product. The glass brick is utilized as part of a glowing two-level façade that fronts New York City’s iconic 5th Avenue and provides a distinctive focal point to the Brickworks studio.

This is a jewel of a project and an exciting one for Mainstay.

Project Teams

Prime Professionals

Red Melbourne

DHD Architects

Engineering Services

AMA Group

LPA (lighting)

Mainstay Engineering (structural)


Clune Construction


MJ Settelen Construction

Mainstay Team Members

Project Manager

Doug Seaboldt, PE

Lead Engineer

Leo Doyer, PE

Project Designers

Matthew Brenfleck, EIT

Luke Roebuck, EIT

photo credit: Chris Cooper


We Welcomed Our 50th Team Member in 2023

We spent the last year building our infrastructure. With the addition of Mike Donnelly, Controller, and Jacqueline Briggs, Vice President of Human Resources, employee benefits and company culture have been a major focus. An Education Assistance Program, paid parental leave and an employee perks program are a few of the benefits we've added to help facilitate our 5 Year Plan. We are poised for growth and are excited for the next 20 years here at Mainstay.

Kelsey Addeo, Project Engineer, Mainstay's 50th team member, pictured above

Check us out!



Heather Doyer

Our condolences to the Doyer family. Mainstay Design Manager, Leo Doyer, lost his sister Heather in early February. Memorial contributions can be donated to The Elwyn Foundation.

Donate in Heather's Name


Paul Coyle

Mainstay would like to pay respects to long time client and friend, Paul Coyle, who lost his battle to pancreatic cancer on February 1st. Paul was one of a kind and will surely be missed.

Paul William Coyle Obituary


Kunkletown Volunteer Firefighter

Tragedy struck one of our team members family this past Christmas Eve. While responding to a fire call on the evening of December 24th, Kyle, a firefighter for Kunkletown Volunteer Fire Company, suffered severe trauma from a fire hose that bulked back and took him down, resulting in multiple fractures to his pelvis. There is a long recovery ahead full of lots of painful physical therapy to get Kyle back up on his feet and walking again.

A Go Fund Me page has been set up to help defray the cost of medical expenses.

Kyle's Go Fund Me Page


Dodging the Winter Blues

2023 is off to a great start! We've been catching up with clients and partners, networking, heading out on site visits and even managed to sprinkle in a little bit of team building.

Picture #1: The Mainstay team at the BeiGene topping off ceremony, Hopewell, NJ

Picture #2: George Cosico makes his mark on the BeiGene project

Picture #3: Justin Meillier and Pamela Assenmacher, ISPE DVC Holiday Soiree

Picture #4: Rikki Moore, Mike Koehne and Doug Seaboldt on the slopes at Blue Mountain

Picture #5: Doug Seaboldt and Mark Paige, ISPE CaSA Life Sciences Show, Raleigh, NC

Picture #6: Jeff Forbes, Reach Climbing team building event

Picture #7: Matthew Conosciani and Justin Meillier, Mainstay Employee Appreciation Day


A Busy Spring Ahead

Although it hasn't quite felt like winter, we are ready for warm weather and sunshine.

Join us on Saturday, May 13th, for a Night at the Reading Phillies hosted by The Chamber of Commerce for Greater Montgomery County. Contact Griffin Stout, if you're interested in FREE tickets! Friends and family welcome.

*Email if you are interested in becoming a sponsor. Limited sponsorships remain.

We hope to see you this spring!