Ho De Leong held various positions from Resident Engineer to General Manager in charge of various water supply projects after graduating from the UK in 1980.
After leading the Consortium to a successful tender for the National Privatization of Solid Waste Management and Public Cleansing Services in 1995, he was appointed COO of SWM Environment, which awarded the concession the management of solid waste and public cleansing services in 27 local authorities in the Southern Region of Malaysia. In 2019, he was appointed as the CEO of SWM Environment.
He is also the co-founder and Chairman of the Waste Management Association of Malaysia (WMAM) and has been actively involved in promoting proper waste management through WMAM. He is also the Board Member of ISWA since 2014, where he leads the Regional Development Network for Asia Pacific region. In 2015, he led WMAM to a successful bid to host the ISWA World Congress in Kuala Lumpur in October 2018, which was a success.
Persatuan Pengurusan Sisa Malaysia also known as The Waste Management Association of Malaysia (WMAM) is an association for waste management professionals. Founded in March 2005, WMAM represents people from many disciplines, including engineering, law, science as well as management.