Legal battles aren’t only waged in the courtroom; they’re also hard fought in the court of public opinion. As testimony in the landmark case, Vegara vs. California, resumed today inside a state superior court, another star witness took the stand — more accurately, the mic — outside the courtroom. Former Los Angeles Mayor Antonio Villaraigosa held...

And so begins the battle of the expert titans. In the landmark lawsuit, Vergara vs. California, the winner may ultimately be the side that had the more persuasive expert witnesses. The first came to the stand today as lawyers for the nine students bringing the suit called Harvard professor Raj Chetty, a renowned expert in public...