HGA is an architecture and engineering firm founded by Dick Hammel, Curt Green and Bruce Abrahamson in 1953. Its services include interior design, landscape architecture, technology, lighting design, sustainable design and strategic planning.

The firm comprises over 850 architects and designers that work from its 11 offices in the US, including studios in Minneapolis, Los Angeles, Boston and Washington DC. Completed projects include a number of community and civic spaces, education, healthcare and government buildings, as well as arts and cultural projects.

Pictured above is a cedar-clad cabin built on a hillside in Minnesota, which hovers up to five metres above the ground to minimise the impact on the landscape.