Wong gained wide attention as a result of his Broadway debut in M. Butterfly opposite John Lithgow. The play won multiple awards, including several for Wong, who at that time ceased using his full name in favor of his initials. He has since ceased the use of punctuation in his initials. He is notable as the only actor to be honored with the Tony Award, Drama Desk Award, Outer Critics Circle Award, Clarence Derwent Award, and Theatre World Award for the same role. In addition to his long-running stint on Law & Order: Special Victims Unit as FBI Psychiatrist Dr. George Huang, he has had recurring roles in All American Girl and as a prison priest on Oz, with guest appearances on The X-Files and Sesame Street. On the big screen, he has appeared in The Freshman (1990), the 1991 remake of Father of the Bride and its 1995 sequel, Father of the Bride Part II, Jurassic Park (1993), Executive Decision (1996) and Slappy and the Stinkers (1997). He also provided the voice of Captain Shang in Disney's Mulan (1998), its direct-to-video sequel, and the video game Kingdom Hearts II. He returned to Broadway as Linus in a revival of You're a Good Man Charlie Brown, alongside Anthony Rapp, Roger Bart and Kristin Chenoweth, and the 2004 revival of Stephen Sondheim's Pacific Overtures.