Hassell is a multidisciplinary architecture, design and urban planning practice with offices in Australia, China, Singapore, USA and the United Kingdom.
After Claridge retired in 1949, the firm became Hassell, McConnell and Partners, and established offices in Melbourne and Canberra.
[5] In 2019, Hassell, then the second-largest design firm in Australia, announced that they would be closing their Adelaide office upon completion of existing projects in 2021, so it could focus on larger urban centres.
[7] In 2023, the firm won a Civic Trust Award for the First Light Pavilion Visitor's Centre at Jodrell Bank Observatory.
[8] The firm's first major project was the Art Deco building at 2 King William Street for the Bank of New South Wales.