Demetrios Stamatakis

Senior Project Engineer

Known for his unwavering ability to always follow through, Demetrious is motivated by a determination to deliver the best end result to clients. As a Senior Project Engineer, he is organized, proactive, and committed, and finds great reward in his ability to solve the daily challenges that this industry brings. Outside of work he is equally as driven. As a second-generation Greek American, Demetrious has been heavily involved in the Greek church and Greek Language School. He has backpacked across Asia, hiked the Pacific Crest Trail, and, when he's not busy with the responsibilities of parenthood, enjoys rock climbing, hiking, and skiing throughout the Pacific Northwest.

Matt Alvarado

Senior Design Engineer

Anita Phonexayphova

Senior Design Engineer

LEED AP

Anita began her career in architecture and has since migrated to the construction world where she enjoys collaborating with design teams and subcontractors to work through constructability issues while achieving design intent. She employs advanced technologies throughout a project’s lifecycle from early design estimates to virtual project handover and closeout. Anita also supports our project teams by coordinating MEP and running clash detection.

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.

John Schimke

Director of Field Operations

Maintaining a personal philosophy centered on family and teamwork, John has skillfully delivered many high technology projects in his 30+ years in the construction industry. Having spent the majority of his career at GLY, he has led all operational aspects of a project from preconstruction planning through finished product. A mentor to our superintendents and crew supervisors, and creative problem-solver, John continues to infuse his projects with the highest and most innovative level of service.

Laura Ovsak

Project Manager

RA, AIA, LEED Green Associate

Laura joined the GLY team in 2017 after spending five years with architecture and engineering design teams. Her varied design experience provides a deep understanding of the design process, and a fluency in the design language. Having worn many hats at GLY, she has developed a diverse skillset, carrying many projects through their phases. Laura recently completed the process of becoming a licensed architect!

Tyler Tonkin

President+CEO

Since joining GLY in 1998, Tyler has played a pivotal role in shaping the company’s culture and project delivery excellence. Now serving as President and CEO, he brings a collaborative spirit, deep technical expertise, and a strategic mindset to every facet of the business. Tyler’s leadership has guided some of GLY’s most complex and transformative projects—from integrated hospital expansions to urban highrise developments. His commitment to client advocacy and team empowerment continues to inspire innovation and elevate performance across the organization.

Danielle Sessler

Senior Project Manager

Associate DBIA™

Construction was always part of the plan for Northwest native Danielle, having grown up in a family that owned a contracting business. She took a few detours first, earning a BFA in Metalsmithing and Art History from Central Washington University and working as a Senior Estimator focused on honing her preconstruction services skills. When she landed at GLY in 2013, we quickly recognized her background would be perfect for Design-Build projects. Outside of work, Danielle enjoys hiking, bouldering, climbing—and collecting “odd things that most people scratch their heads over.”

Brad Hughes