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Owner / Founder

Billy Janhunen, SE

I'm Billy Janhunen, a licensed Structural Engineer with a passion for designing innovative, efficient, and resilient structures. With over 15 years of experience, I’ve worked on a diverse range of projects—from high-end residential and commercial buildings to complex seismic retrofits and sustainable designs. My approach is shaped by a Master of Science in Earthquake Engineering from the ROSE School in Pavia, Italy, and a Bachelor of Science in Architectural Engineering from Cal Poly, San Luis Obispo.

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Before founding Timberline Structural Engineering, I was a lead principal at Gabbart & Woods Tahoe Partners and honed my skills in the San Francisco Bay Area, including at Tipping Structural Engineers. During my time there, I contributed to multiple award-winning projects, earning national engineering recognition for excellence in design. I’m licensed Structural Engineer in California, Nevada, and New Mexico, and I bring a collaborative, detail-focused approach to every project.

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With expertise in BIM modeling, exposed steel detailing, and complex site conditions, I specialize in seamlessly integrating structure with architectural vision and constructability.

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Outside of work, I’m drawn to the mountains—whether backcountry skiing, mountain biking, or skiing at Alpine Meadows. Most importantly, I love spending time with my wife, Flyne, and our daughter, Sloane.

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Publications

  • BRB Mast Frames: An Improved Approach to Seismic-Resistant Design Using Buckling-Restrained Braces
    ATC-SEI Conference on Improving Seismic Performance of Buildings 2015 - Proceedings 

Authors: Leo Panin, SE, Nick Bucci, SE & Bill Janhunen, SE​

  • 680 Folsom - Ancient Meets Modern Ingenuity in an Unprecedented Seismic Solution
    Structure Magazine, April 1, 2015
    Spotlight article on the award-winning seismic retrofit project at 680 Folsom Street, recognized with the 2014 NCSEA Annual Excellence in Structural Engineering Award in the Forensic/Renovation/Retrofit/Rehabilitation Structures category.

Authors: Bill Janhunen, SE & Gina Phelan

  • Seismic Retrofit of a 1960s Steel Moment-Frame Highrise Using a Pivoting Spine
    SEAOC - 2013 SEAOC Convention Proceedings, San Diego
    Seismic retrofit of 680 Folsom Street, utilizing a concrete core supported on a friction pendulum bearing and pivoting spine to address drift and distribute yielding across the structure.

Authors: Bill Janhunen, SE & John Wolfe, SE

  • Seismic Retrofit of a 1960s Steel Moment-Frame Highrise Using a Pivoting Spine
    Los Angeles Tall Buildings Structural Design Council: Proceedings of the 2013 Annual Meeting

Authors: Bill Janhunen, SE, John Wolfe, SE & David Marr, SE

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