Browning started a career in water shows, moving on to produce shows. Browning worked at Wakulla Springs in the 1940s and learned to perform in underwater newsreels conceived by Newt Perry, who later took Browning along when he opened Weeki Wachee Springs. While working at Wakulla Springs in 1953, Browning was asked to show around a film crew scouting for shooting locations.
According to Browning, "Their cameraman asked if I could swim in front of the cameras so they could get the perspective of the size of a human being against the fish and the grass. So I did." Days later, the crew offered Browning the role of the titular Gill-man in the film Creature from the Black Lagoon (1954). Browning accepted and played the Gill-man in the film's underwater scenes, while actor Ben Chapman played the monster on land. During filming, Browning reportedly held his breath underwater for up to four minutes at a time. Browning reprised his role as the underwater Gill-man in two sequels, Revenge of the Creature (1955) and The Creature Walks Among Us (1956).
He continued in movie production and joined Ivan Tors' studios in Florida, where he co-wrote and co-produced the 1963 film Flipper (about an intelligent bottlenose dolphin); Browning also directed the second unit underwater scenes for the film. Browning continued writing for the subsequent Flipper television series that debuted in 1964. He directed the underwater sequences in Hello Down There (1969), and directed the family film Salty (1973) and the cult film Mr. No Legs (1978). He also worked as second unit director, stunt coordinator and underwater sequence director on a number of features, including Thunderball (1965), Around the World Under the Sea (1966), Island of the Lost (1967), Caddyshack (1980), and Never Say Never Again (1983).
