Pioneering Leadership. Comprehensive Perspective.

High-performance, sustainable buildings don’t just happen by accident. They require careful planning and a global perspective to ensure projects are completed to the highest environmental, efficiency, quality, durability, and health standards available today.

Tadashi Shiga

Principal –


Growing up with deep roots in the Seattle real estate and development community, Tadashi has been a real in the area for over 30 years. In 2007, he dove into learning about sustainability and energy efficiency for homes, shifting his focus and gaining a new passion when he created Evergreen Certified, LLC. Tadashi become a HERS Rater and Energy Star verifier, and slowly started growing a large client base of developers and builders in the Seattle area looking to build green. Today Evergreen Certified has a client base of 250 builders and provides verifier and rater services for numerous programs including Built Green, PHIUS+, HERS, Energy Star, and more.

Tadashi was the first PHIUS rater in Washington, and was involved with the first DOE Builder’s Challenge home in the state in 2010. Evergreen Certified won the Built Green Hammer Award in 2013, and the Built Green Pioneer award in 2018 and has been the green verifier for the 2013 & 2015 DOE Housing Innovation Award for Dwell Development projects. Tadashi has also been hard at work turning his own home on Vashon Island into a Net-Zero property. Tadashi leads a passionate team of green building professionals who help Seattle be a greener place.

Lisa Henry 

Builder Support Manager –

An electrical engineer by education, Lisa’s true passion lies in residential construction, building science, and project management.  Lisa has been in the King County building industry since 2005 and has bags-on experience in SFR/TH construction from site development to final finish.  Having built or managed over 80 homes to completion, Lisa understands the challenges that face builders through all phases of construction from permit to certificate of occupancy.  Through her field experience and post purchase warranty work with homebuyers, Lisa has seen first-hand the importance of a well-sealed and insulated building envelopes that incorporate smart energy efficient systems and provides for healthy indoor air quality.  She is excited to assist builders through design and implementation of sustainable healthy home construction.  Lisa aims to make building green the new standard in residential construction.

In her play time, you can find Lisa cheering on the Sounders, floating in Lake Washington with her partner and water-loving dog Ruby, or traveling to New England and the Midwest to visit family.

Cybil Tribie

Builder Support Coordinator –

Having studied Environmental Science with an Engineering and Technology concentration, Cybil realized her passion for green buildings in the many classes she took. Her favorite was in fact ‘Environmentally Friendly Buildings’ where she learned much of what she is applying in to her work today. Beyond her knowledge of green practices, Cybil worked on the construction site for Habitat for Humanity where she gained some useful hands-on building experience. While working there, she learned the greater long-term value in building sustainably for everyone.

Her goal at Evergreen Certified is to make everything as easy as can be. Working from the ground up, Cybil can be found out on sites, holding builder meetings, and compiling final submittals. When not at work, Cybil likes to spend time watching movies, learning a new hobby, or returning home to Port-au-Prince Haiti to visit family and appreciate the warmth of constant sunshine!

Greta Tjeltveit

Builder Support Coordinator –

Greta first found her passion for sustainable building while doing a research paper on the work being done to rebuild New Orleans after Hurricane Katrina. Since then she’s continued to learn more about green design, residential construction, and cultural and historical preservation while studying architecture at the University of Washington. After obtaining her B.A. in Architectural Studies, she spent two years gaining construction experience at Habitat for Humanity.

Now as the resident young person in the office, Greta plans to kickstart Evergreen Certified’s social media presence, do site visits, blower doors, energy models, submittals, but most importantly, keep the team up to date with hip lingo.

Outside of work, you’ll find Greta on the soccer pitch, hitting the trails: running or hiking, listening to live music, or watching Seattle and Minnesota sports.

P.S., it’s pronounced “Chelt-vayt”

Tracy Yamada

Office Administrator –

As our Office Administrator, Tracy handles all of Evergreen Certified’s proposals and financial interactions with our fantastic clients.

After having the opportunity through her husband’s work to have lived in many states and overseas, Tracy found a new love for sustainability. She is happy to have this opportunity to work with Tadashi and his team.

Tracy spends most of her time outside of work caring for her two children. If not at a pool watching swim meets or being the family taxi, you can find her at the gym, spending time with friends and enjoying the outdoor beauty of the Pacific Northwest.