About
Mercer Seismic PLLC is a licensed structural engineering firm based in Seattle, Washington.
Heejae Yang, PE, SE
Principal Engineer, Mercer Seismic PLLC
Heejae Yang is a licensed Structural Engineer with over eighteen years of experience in structural analysis and design. He holds a Bachelor's and Master's degree in Civil Engineering from Johns Hopkins University and has been a licensed Professional Engineer since 2013.
His career has focused on complex commercial and institutional structures — from high-rise towers and hospitals to seismic retrofit of schools and civic facilities.
Why Mercer Seismic
Founded in response to a broken market.
Mercer Seismic was founded after observing firsthand how Seattle's residential seismic retrofit market operates in practice — and how rarely it operates in the homeowner's interest. The firm exists for one purpose: to provide homeowners with the independent structural engineering advocate the industry is designed to exclude.
Mercer Seismic does not sell construction. It does not partner with contractors. Every engagement is structured to serve the homeowner exclusively — with the professional accountability of a stamped engineering document behind every finding and recommendation.
Washington State SE #51786
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