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Professional portrait of GLY employee David Craig.

David Craig

Senior Estimator

Headshot of Jon Friedrichsen

Jon Friedrichsen

Project Executive

Dwight Hansch Headshot

Dwight Hansch

Superintendent

Headshot of Brett Harrison

Brett Harrison

Project Executive

Headshot of Tyler Tonkin

Tyler Tonkin

Principal+Executive Vice President

Headshot of Cassie Withrow

Cassie Withrow

Executive Administrator

Headshot of Danielle Sessler

Danielle Sessler

Senior Project Manager

Professional portrait of GLY employee Dennis Sizemore.

Dennis Sizemore

Cement Mason Superintendent

Professional portrait of GLY employee Jamie Hawk.

Jamie Hawk

General Foreman

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2023 GLY Construction, Inc.

Headshot of Jon Friedrichsen

Jon Friedrichsen

Project Executive

HCC

Jon attributes his appreciation of craft and hard work to working as a carpenter for a Spokane-based general contractor while earning a BS in Construction Management from Washington State University. Since joining GLY in 1999, he’s honed his expertise as a healthcare and high-tech office project manager and team builder. When he’s not piecing together complex logistics plans, you’ll find Jon cheering on the Seattle Sounders or casting a line. If he could talk his wife into selling everything and living in a trailer down by the river, he’d be there already.

Dwight Hansch Headshot

Dwight Hansch

Superintendent

Headshot of Brett Harrison

Brett Harrison

Project Executive

Headshot of Tyler Tonkin

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.

Headshot of Cassie Withrow

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.

Headshot of Danielle Sessler

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.”

Professional portrait of GLY employee Dennis Sizemore.

Dennis Sizemore

Cement Mason Superintendent

Dennis is the go-to guy on anything and everything concrete. At age 15, he poured and finished driveways, patios, and shop slabs. When he started at GLY at 18, he was the youngest journeyman in his union. Today, he's a concrete master who oversees projects up to one million square feet. His favorite aspect of the job is the constant change of scenery since he's not on one single project for an extensive amount of time. While concrete is a big part of Dennis’s life, he makes plenty of room for his kids, fishing, hiking, and visiting Kauai, his happy place.

Professional portrait of GLY employee Jamie Hawk.

Jamie Hawk

General Foreman