Fulton County prosecutors sought to counter the testimony of an Emory University sleep expert who testified at the ongoing murder trial of Atlanta attorney Claud “Tex” McIver with an expert of their own.

On Monday, prosecutors called Dr. Mark Pressman, a psychologist and forensic sleep specialist who is also an adjunct law professor at Villanova University’s Charles Widger School of Law. Pressman is also a clinical professor of medicine at Jefferson Medical College in Philadelphia.