Tomas lived in a village when he was younger, later going to a university that both Joseph Lai and Godfrey Ho were studying at. He shared a dorm with Joseph, where they both became very close friends and graduated on the same year. In 1974, Tomas created Filmark International Ltd. and later began working with Joseph as a producer for the company Asso Asia Films Ltd. around 1977. After Asso Asia closed and he and Joseph split from each other in 1983, he turned full time to making movies for his company. He continued to work and distribute films until 1989, when Filmark mysteriously stopped production. He died in the 1996 Garley Building Fire of Hong Kong where both the offices for IFD Films Ltd. and Filmark were, which also ceased the end of his company.