Background: Oldman was born in New Cross, London, the son of Leonard Bertram Oldman (1921-1985), a former sailor who also worked as a welder, and Kathleen (nee Cheriton; born 1919). He has stated that Leonard was an alcoholic who left the family when Oldman was seven years old. Oldman attended West Greenwich School in Deptford, leaving school at the age of 16 to work in a sports shop. He was a pianist as a child, and later a singer, but gave up his musical aspirations to pursue an acting career after seeing Malcolm McDowell's performance in the 1971 film The Raging Moon.
Context: In 1991, Oldman starred in his first US blockbuster, playing Lee Harvey Oswald in Oliver Stone's JFK. According to Oldman, very little was written about Oswald in the script. Stone gave him several plane tickets, a list of contacts and told him to do his own research. Oldman met with Oswald's wife, Marina, and her two daughters to prepare for the role. The following year, he starred as Count Dracula in Francis Ford Coppola's romance-horror Bram Stoker's Dracula. A commercially successful film adaptation of Bram Stoker's 1897 novel, it was a box office success worldwide. Oldman's performance was recognised as the best male performance of 1992 by the Academy of Science Fiction, Fantasy & Horror Films, which awarded Oldman its Best Actor award. Oldman later became a popular portrayer of villains: He played violent pimp Drexl Spivey in the Tony Scott-directed, Quentin Tarantino-written True Romance (1993), a role which MSN Movies described as "one of cinema's most memorable villains"; a sadistic prison warden in Murder in the First (1995); futuristic corporate tyrant Jean-Baptiste Emanuel Zorg in The Fifth Element (1997); and Dr. Zachary Smith/Spider Smith in the commercially successful but critically panned Lost in Space (1998). He was considered for two roles in Quentin Tarantino's Pulp Fiction (1994), but neither were realised. Tarantino contemplated Oldman as gangster Jules Winnfield (played by Samuel L. Jackson), while TriStar executives recommended him for drug dealer Lance (portrayed by Eric Stoltz). In 1994's Leon: The Professional, he played corrupt DEA officer Norman Stansfield, which has since been named by multiple publications as one of the best villains in cinema. Oldman also portrayed various accents; along with the Transylvanian Count Dracula, he gave a critically acclaimed reading of German-born Viennese composer Ludwig van Beethoven in Immortal Beloved, and played Russian terrorist Egor Korshunov in the 1997 blockbuster Air Force One. He portrayed another historical figure, Pontius Pilate, in Jesus (1999). Oldman was considered for the role of Morpheus in The Matrix. He served as a member of the Jury at the 1993 Cannes Film Festival. In 1998, MTV's Celebrity Deathmatch aired a match between claymation representations of Oldman and Christopher Walken to determine the greatest cinematic villain. Oldman appeared opposite Jeff Bridges as zealous Republican congressman Sheldon Runyon in The Contender (2000), in which he was also credited as a producer. Oldman received a Screen Actors Guild Award nomination for his performance. In 2001, he starred opposite Anthony Hopkins in Hannibal, as Mason Verger, the only surviving victim of Hannibal Lecter. He reportedly spent six hours per day in the make-up room to achieve the character's hideously disfigured appearance. It marked the second time that Oldman had appeared opposite Hopkins, a personal friend who was part of the supporting cast of Bram Stoker's Dracula. Oldman is uncredited in the film, reportedly over a dispute regarding top billing, which was going to co-star Anthony Hopkins and Julianne Moore. He received an Emmy Award nomination for two guest appearances in Friends in May 2001, appearing in the two-part episode "The One With Chandler and Monica's Wedding" as Richard Crosby, a pedantic actor who insists that "real" actors spit on one another when they enunciate, leading to tension, then friendship, with Joey Tribbiani (Matt LeBlanc). Oldman had previously worked with LeBlanc on Lost in Space. CANNOTANSWER
Question: What garnered his success?

Answer:

In 1991, Oldman starred in his first US blockbuster, playing Lee Harvey Oswald in Oliver Stone's JFK.