ORLANDO, Fla. -- The public relations firm representing Casey Anthony's defense team could be hurting her case because of controversies surrounding the company, according to an expert.

Todd Black, the spokesman for Jose Baez and his defense team, works for Press Corps Media and has come under scrutiny because he uses a fake name and has never been seen, leading to speculation about his real identity.

Black is paid by an anonymous Connecticut family that reportedly hired Press Corps Media, which was founded by Gil Cabot, a convict who served prison time for trying to extort money from a Los Angeles television anchor.

Black has repeatedly denied that he is Cabot but acknowledged that Cabot has been retained...