Ken Yeang is a principle at T.R.Hamzah & Yeang Sdn.Bhd, an international architect firm with its HQ in Kuala Lumpur, Malaysia. The firm has been in existence over 2 decades, with projects in Europe, USA and Asia. Key projects include the high-rise National Library Board building (Singapore), the 40-storey Eco-Tower at Elephant & Castle, the 24-storey IBM Building (Malaysia) and 15-storey Mesiniaga Building (IBM franchise) (Malaysia), Wirrina Cove Condominium (Australia).

The principals are Tengku Robert Hamzah and Dr. Ken Yeang. Both the principals' architectural education were at the AA (Architectural Association) School (London). Tengku Robert Hamzah, a prince in the Malay Royal family, completed the AA Tropical Architecture School course under Dr.Otto Koenigsberger. Dr. Ken Yeang subsequently received a doctorate from Cambridge University (UK) on ecological design.

The firm has received over 20 awards including the Aga Khan Award Archiecture (1995) and the RAIA International Award (in 1997 and 1999). The firm's work has been published extensively in the international press.

The firm's design expertise is in their ecological approach for the design of large projects and buildings that include consideration given to their impacts on the site's ecology and the building's use of energy and materials over its life-cycle. Much of the firm's early work pioneers the passive low-energy design of skyscrapers, as the 'bioclimatic skyscraper'. The firm is a long-serving member of the Council on Tall buildings and Urban habitat (USA). The firm practices Cost Planning ( in delivering Projects to be within Client's budget) with great emphasis on rigorous in-house project management and control.