While the introduction of sound led to a boom in the motion picture industry, it had an adverse effect on the employability of a host of Hollywood actors of the time. Suddenly those without stage experience were regarded as suspect by the studios; as suggested above, those whose heavy accents or otherwise discordant voices had previously been concealed were particularly at risk. The career of major silent star Norma Talmadge effectively came to an end in this way. The celebrated German actor Emil Jannings returned to Europe. Moviegoers found John Gilbert's voice an awkward match with his swashbuckling persona, and his star also faded. Audiences now seemed to perceive certain silent-era stars as old-fashioned, even those who had the talent to succeed in the sound era. The career of Harold Lloyd, one of the top screen comedians of the 1920s, declined precipitously. Lillian Gish departed, back to the stage, and other leading figures soon left acting entirely: Colleen Moore, Gloria Swanson, and Hollywood's most famous performing couple, Douglas Fairbanks and Mary Pickford. After his acting career collapsed due to his Danish accent, Karl Dane committed suicide. As actress Louise Brooks suggested, there were other issues as well: