A surprising Married at First Sight expert is facing heat from fans for how they’ve been performing their job, and they are discrediting themselves. Married at First Sight has always had a panel of three experts whose job is to match the couples and guide them through the eight-week-long experience. 79-year-old Dr. Pepper has been the longest-standing expert, as she joined in season 1. 63-year-old Pastor Cal Roberson, who is the expert getting the criticism from fans, was added as an expert in season 4. 39-year-old Dr. Pia is the newest expert, having joined in season 15.