Here's what I can find:
Movies:
* The Heroic Trio (1993) - This is probably his most recognizable role.
* The Killer (1989)
* A Better Tomorrow (1986)
* The Big Boss (1971) - This is his earliest film credit.
Television:
* Kung Fu Killer (2001) - A Hong Kong TV series.
Other Projects:
* The Heroic Trio (1993) - A video game based on the film.
Important Notes:
* This list is not exhaustive. Gary Siu may have been in other films and TV series, but they are not well documented online in English.
* Much of his work is in Cantonese, which is harder to find information on for English speakers.
* He is often credited under variations of his name, like Gary Chiu or Siu, which complicates searching.
To find more information, you might try:
* Searching online databases for Hong Kong films.
* Looking for his work on websites like Hong Kong Movie Database (HKmdb) or IMDb.
* Using a Cantonese search engine to find more information about his career in Chinese.
Let me know if you have any other questions about Gary Siu's work!