After 25 years working at London Dockland Development Corporation in the UK and Rocco Design Ltd. in Hong Kong, William set up Arva Ltd. in 2015. With a series of award winning projects, William has developed a reputation for innovative design and pragmatic execution ranging from offices, residential, urban complexes, hotels, schools, art and cultural facilities, including museums, galleries and performance related facilities, civic buildings, such as government headquarters. He has been involved in a number of competition and award winning projects including the Kai Tak Residential Development in Hong Kong, Hefei TOD Urban Complex in An Hui, China, Chu Hai University College in HK, Okura Hotel in Taipei, Guangdong Museum in Guangzhou, HKSAR Government Headquarters in Tamar, Yunnan Museum, East Kowloon Cultural Complex, IFC urban complex and Airport Express HK Terminal, and the West Kowloon Cultural District in HK.

Alongside with practice, William is the Associate Professor of Practice at the University of Hong Kong, and the Adjunct Associate Professor at the Polytechnic University of HK. He also lectures on a range of subjects from urbanism, architectural typologies such as hotel, civic buildings etc.,  to the application of architectural technologies including façade and passive sustainable methodology around the region.