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Headshot of Isaias Villa

Isaias Villa Galvan

Safety Director

CSP, CHST

Headshot of Cassie Withrow

Cassie Withrow

Executive Administrator+Administrative Services Manager

Donovan Mabbott

Superintendent

Stephanie Justice

Marketing Strategist

Headshot from Jose Ramirez

Stephen Robeson

Project Executive

Matt Alvarado

Senior Design Engineer

Professional portrait of GLY employee Janine Messina

Janine Messina

Marketing Manager

Steve Heymes

MEP Specialist

Professional portrait of GLY employee Sarah Cunningham.

Sarah Cunningham

Foreman

All People

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2026 GLY Construction, Inc.

Headshot of Cassie Withrow

Cassie Withrow

Executive Administrator+Administrative Services Manager

Excellent customer service comes naturally to Cassie, who approaches every task with a can-do attitude. As Executive Administrator, she enjoys working with people that encourage her and test her limits but allow her to have fun along the way. She manages her time—and many others’—with extraordinary ease and keeps things running like a well-oiled machine. Outside the office, you’ll find Cassie hiking, exploring the city, and when the sun comes out, boating on Lake Washington—all with her husband and pups by her side.

Donovan Mabbott

Superintendent

Over the last 30 years, Donovan’s appreciation for quality craftsmanship combined with his natural ability to manage the many moving parts and pieces of a construction jobsite from start to finish has garnered trust and respect from GLY employees, trade partners, and clients. From interior build-outs to full campus developments, he approaches each project by tapping into each team member’s strengths, talents, and skillsets to develop a thoughtful plan—together. Witnessing that plan unfold successfully is his favorite part of his job. On the home front, there is never a dull moment with his four kids, granddaughter, and three dogs—each bringing joy to the family with their own unique personalities. Skylar, the littlest pup, runs the pack.

Stephanie Justice

Marketing Strategist

Headshot from Jose Ramirez

Stephen Robeson

Project Executive

CHC

Stephen is one of our Interiors + Special Projects [ISP] team leaders, overseeing renovation and tenant improvement work in multiple market sectors. He is an ASHE Certified Healthcare Constructor and holds a BS in Construction Management from Central Washington University. With GLY since 2018, he is known for his high energy and ability to juggle multiple commitments with ease while still making time to mentor and guide others. He is an active member of the Puyallup community who enjoys spending time with family exploring the outdoors.

Matt Alvarado

Senior Design Engineer

Professional portrait of GLY employee Janine Messina

Janine Messina

Marketing Manager

CPSM

Janine feels at home in the world of marketing since it combines her passion for art, writing and graphic design with her natural ability to organize, strategize, and analyze. While she enjoys her day-to-day responsibilities, facing new challenges, and the many opportunities to apply her creativity, her favorite part about her job isn’t even marketing-related; she loves working with people and getting to know everyone in the company top-down—from estimating to IT to the hundreds of hard-working craftspeople out in the field.

Steve Heymes

MEP Specialist

Professional portrait of GLY employee Sarah Cunningham.

Sarah Cunningham

Foreman

As a field supervisor, Sarah is known for always thinking ahead and looking out for everyone’s best interest. She enjoys the camaraderie on the jobsite and the pride that comes from persevering and building something together. A recent project of Sarah's featured a major geothermal energy system, and she used that experience to teach others at GLY about geothermal energy and how different types of systems can be used. Her hobbies include hiking, cycling, gardening, and traveling the world every chance she gets. But her favorite thing? Golden Retrievers!