Brian Kelberg was a deputy district attorney who joined the prosecution team to handle the case's forensic medical evidence, taking on a central role in the trial and a willingness to acknowledge uncomfortable truths — including that the coroner, Dr. Irwin Golden, had made mistakes. Over 29 days spanning motion hearings and witness examinations, Kelberg conducted the extensive direct examination of Chief Medical Examiner Dr. Lakshmanan Sathyavagiswaran and launched aggressive, methodical cross-examinations of defense medical experts Dr. Robert Huizenga and Dr. Michael Baden, using exercise videos, medical records, and prior testimony to challenge defense claims about Simpson's physical limitations and to undermine Baden's forensic conclusions. His approach was distinctive on the prosecution team — he openly disagreed with colleague Hank Goldberg on legal strategy regarding expert cross-examination scope, and he framed the trial's medical evidence as a contest that should be won on science rather than on peripheral attacks against witnesses' character.