Dwight Hansch
Superintendent
Cassie Withrow
Executive Administrator
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.
Andrea Miller
Project Manager
Andrea earned a BS in Mechanical Engineering from Drexel University in Philadelphia, Pennsylvania before heading west. Prior to joining GLY in 2020, she spent 12 years managing projects for Seattle’s leading healthcare providers, which continues to be her focus. A strong dedication to understanding client goals is paramount in Andrea’s approach to her role; this approach is what makes Andrea well-known for her time management, integrity, and discipline—qualities she also brings home with her as she coaches CrossFit and raises two busy children.
Greg Burke
PE Operations Manager
Associate DBIA™
With nearly 20 years of experience under his belt as Project Engineer [PE], Greg understands the unique requirements of this vital role. Today, as PE Operations Manager, he leads the charge in setting Project Engineers up for success—focusing on development, growth, and establishing mentorships. Greg’s ability to recognize and appreciate diversity in personalities and skills among the group helps cultivate a learning environment that leaves plenty of room for exploration and innovation. Outside of work, Greg's go-to pastimes include mountain biking, fly fishing, and cooking for family and friends.
Tyler Tonkin
Principal+Executive Vice President
Tyler’s collaborative approach to problem solving and strong technical abilities have helped him successfully lead some of GLY’s most complex and challenging projects. From delivering fully integrated hospital expansions in occupied campus settings to redeveloping a waterfront building into a high-tech research facility with vibration isolation technology, Tyler is driven to chart a course for the team to meet the challenges inherent to the built environment. As both a Principal and member of GLY’s Executive Team, Tyler has built a reputation as a committed client advocate and enthusiastic leader who brings out the best in our teams.
Luiselin Mujica
Project Engineer
Lu was born in Valencia, Venezuela, a small town two hours from the capital city of Caracas. After earning a BS in Civil Engineering from the University of Florida, she worked as a Field Engineer on transportation projects in Orlando and Miami, responsible for managing quality assurance. Growing restless, she journeyed west to Seattle and in 2021 joined GLY. Lu’s involvement on a project includes serving as a liaison between the owner and design team and providing effective solutions in the design process and material installation.
Garth Stoppard, Jr.
Superintendent
As a second generation carpenter, Garth turned out to be a Jr. in more ways than one. Today Garth is a hard-working Superintendent who enjoys building challenges across sectors, from housing to commercial construction. Garth takes a very thorough, caring approach to getting things done on his projects, and enjoys the outdoor life in his spare time—especially riding dirt bikes, camping or doing anything on or near the water.
Adam Cisler
Senior Project Engineer | R+D Manager
LEED Green Associate
Adam has extensive experience in the industry, gaining valuable insight from working in various roles: carpenter, surveyor, estimator, and project engineer. He also draws on his military experience to bring honesty, integrity, and sound judgment into day-to-day project management. As a FAA part 107 certified drone pilot, and expert in emerging XR technologies, Adam is pioneering GLY’s research and development in advanced technologies, looking for solutions with job site applicability. When Adam isn’t working or spending time with his wife, he taps into his artistic side by drawing, painting, printmaking, playing guitar, and songwriting… just to name a few!
Bryan James
Senior Preconstruction Manager
LEED AP BD+C
In his 20+ years of experience in the construction industry, Bryan has developed a strong attention to detail and steadfast commitment to the desires and concerns of the client. His expansive and diverse range of experience demonstrate his work ethic, and ability to approach any project with focus and determination. His role of Senior Preconstruction Manager includes budgeting work, value engineering, and cost control of the project. He values a tenacious dedication to the project, providing clients with a high-quality experience.