(TheDrinksBusiness) - The wine fraud case being played out in a New York court room between rival billionaires turned personal this week as a former servant of Eric Greenberg took the stand against his one-time employer.

Jaime Cortes worked for Eric Greenberg for four years as his personal chef and manager of his home in Ross, California. According to Forbes, he took the stand as a witness against his former employer after reading about the case in The Wine Spectator and offering his services to Bill Koch’s legal team – the billionaire wine collector is suing Greenberg for US$320,000.

Although there is some doubt as to whether or not this breaches a confidentiality agreement he signed is in question – he claims he does not remember signing it. Koch is not recompensing him for being a witness but is said to be covering his legal fees.