May 06 2021, 3:13 AM May 06 2021, 1:42 AM May 06 2021, 3:13 AM (Bloomberg) -- Lawyers for Elizabeth Holmes attacked the credibility of an Ivy League medical school professor who prosecutors want to testify at her upcoming criminal trial, arguing heâs being used to âparrotâ a potentially more damaging witness -- an ex-Theranos Inc. laboratory director. (Bloomberg) -- Lawyers for Elizabeth Holmes attacked the credibility of an Ivy League medical school professor who prosecutors want to testify at her upcoming criminal trial, arguing heâs being used to âparrotâ a potentially more damaging witness -- an ex-Theranos Inc. laboratory director. For a second day, Holmes and her lawyers appeared in-person Wednesday in the federal court where the Theranos founder and former chief executive officer is scheduled to go to trial in August on charges that the blood-test startup once valued at $9 billion was a fraud. U.S. District Judge Edward Davila in San Jose, California, is winnowing the evidence and testimony jurors will consider.