Graduated from the Nanyang Academy of Fine Arts, Singapore in 1974, he was awarded the Best Still Life Award in Singapore Young Contemporary Art Competition during the same year. After that, he taught art and pottery at the KL College of Art (KLCA), Central Academy of Art (CAA) and Yayasan Seni Artisan Centre and Gallery. Solo exhibitions include "Down Memory Lane" at Yan Fine Art Gallery, Kuala Lumpur (2007) and "A Day at a Kampung" at Shell Malaysia 2008 Corporate Calendar Launches (2007).

Lam Le Siang also exhibited in numerous group shows, such as "Local Fruits Painting Exhibition", jointly organized by the Ministry of Agriculture and National Art Gallery, Sheraton Imperial Hotel, Kuala Lumpur (2000 & 2001), “Untitled Exhibition”, Shah Alam Art Gallery (2001), “IDENTITIES-Who We Are?” Art Exhibition, National Art Gallery (2002), "Soaring to New Frontiers" Art Exhibition at NAFA Galleries, Singapore (2005), "Lilly Oncology on Canvas Art Competition & Exhibition", Royal College of Art, London (2006), "Canvas Arts" Contemporary Art Exhibition at Alliance Francaise De Kuala Lumpur (2012), NAFA Alumni Association's 39th Annual Art Exhibition in Singapore (2014), "Art Asia 2014", Stadium Chinwoo, Kuala Lumpur (2014) and many more.

His works can be found in the public collection of FAMA Ministry of Agriculture, Exxon-Mobil, Star Cruise, YTL Corporation, Sri Acappella, Sin Heap Lee Foundation, Yayasan Seni Artisan Centre, Shell Malaysia and Daiichi Modern Art Gallery.