Mark Muszanowski joined ESD in 1973, the same year the Willis Tower was completed. Now, he works in our new headquarters in what is still Chicago’s tallest building. Happy 45th... | SnapWidget

Mark Muszanowski joined ESD in 1973, the same year the Willis Tower was completed. Now, he works in our new headquarters in what is still Chicago’s tallest building. Happy 45th anniversary, Mark! #esd #engineering #willistower #anniversary

by esdglobal 7 years ago | via Instagram

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by derg6 7 years ago | via Instagram

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by derg6 7 years ago | via Instagram

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by derg6 7 years ago | via Instagram