Alongside his brother, Jimmy was often hailed as one of Hong Kong's most successful presenters/producers, and one of the most controversial due to his family's background. Heung is widely suspected of ties to one of Hong Kong's largest and most powerful organized crime groups, the Sun Yee On Triad. His father, Heung Chin, founded the Sun Yee On in 1919..
The two became partners in the formation of Win's Entertainment Ltd., However, the partnership ended in 1992 as Charles felt that Jimmy's style of negotiating business, too closely resembled that of a triad member. Following the partnership split between Charles and Jimmy, Win's Entertainment Ltd. later became a subsidiary for Charles' production company China Star Entertainment Group, which he formed in 1992. While Charles sees Jimmy as a "good triad," it is widely believed that Jimmy has moved on, and supposedly runs the triad to this day.
Jimmy was the producer of films featuring some of Hong Kong's cinematic icons. This included films such as the ''Fight Back to School'' trilogy, and the ''God of Gamblers'' series. A majority of the stars he highlighted as a presenter included Stephen Chow, Andy Lau, Chow Yun Fat, Rosamund Kwan, and Ng Man Tat. Jimmy made his directorial debut with the 1992 film ''Casino Raiders'' which he co-directed with Wong Jing, with his brother Charles in a supporting role. The film was followed by a sequel, ''Casino Raiders 2'' was produced by Jimmy and directed by Johnnie To.