Jehan engaged with the subject matter of traditional Malaysian scenery, featuring wooden houses and stilt topography with his distinctive style in his celebrated Melaka River series. Jehan experimented with watercolour collage on crinkled rice paper in the late 1980s and later perfected this as his distinctive technique. He was given his first two solos by Frank Sullivan at Samat Art Gallery in 1968 and 1970. In 1961, he won a Merit Award in the Art India exhibition and in 1969, he won the 1st Prize (Category D) in the prestigious Salon Malaysia for his work entitled Sad October. He studied at the Nanyang Academy of Fine Arts in Singapore where he was mentored by Cheong Soo Pieng. After graduating in 1960, he taught at Pay Fong Middle School in Malacca for 22 years. He turned fulltime into art in 1983.