Adam Rosendorff, former Theranos lab director, has quickly become a pivotal witness for the prosecution and a thorn in the side of founder Elizabeth Holmes' defense attorneys.
Tuesday marked Rosendorff's fifth day of testimony Holmes' trial, much of which centered on sharp cross-examination by defense attorney Lance Wade.
Holmes, founder of the notorious blood-testing startup, faces fraud charges.
"It's been a bit combative," Heather Somerville, reporter covering the trial for the Wall Street Journal, told KCBS Radio's Margie Shafer on Tuesday.
Rosendorff was the lab director from 2013-2014, just a little over a year.
His testimony has been especially compelling because he’s been able to draw a distinct line from the inaccurate results coming out of Theranos' testing devices to what Holmes actually knew. "His testimony has shown that she had plenty of knowledge and plenty of opportunity to address them," said Somerville.
Although Rosendorff has been holding up quite well under cross-examination, it's becoming apparent that both Wade and Rosendorff are getting "irritated, frustrated with each other," she said.
Rosendorff was also a critical source for Somerville's former Wall Street Journal colleague John Carreyrou's reporting that ultimately exposed Theranos' faulty devices and led to the dissolution of the company.
Carreyrou has yet to be subponead for the trial, but it's expected.
Following Tuesday's proceedings, Rosendorff is expected to get a break. The next witness most likely called to the stand on Wednesday is another former lab director – specifically a dermatologist that filled in.
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