Wiliam Sim is a full-time art practitioner and a partner at a visual arts studio based in Singapore. A graduate of the Nanyang Academy of Fine Arts, he has experimented with various media and exhibited his works regionally. He is also the illustrator behind the popular Colouring the Lion City series as well as two illustrated books on Singapore. Botanical Singapore looks at the native plants in the city while in Out & About in Singapore, he and his co-author introduce the popular sights to young readers.