T.R.Hamzah & Yeang Sdn.Bhd. is an international architect firm with its HQ in Kuala Lumpur, Malaysia, best known for designing innovative signature green buildings and masterplans. The firm has been in existence over 3 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, and had completed the AA Tropical Architecture School course under Dr.Otto Koenigsberger. Dato' Dr. Ken Yeang subsequently received a doctorate from Cambridge University (UK) on ecological design.