Dr. David Egilman, a physician and expert witness who, over a 35-year period, testified in nearly 600 corporate wrongdoing trials, winning billions of dollars in awards for victims and their survivors, died April 2 at his home in New York. Foxborough, Massachusetts. He was 71 years old.The cause was cardiac arrest, his son Alex said.Many medical experts have a sideline in court, offering their informed opinions on the witness stand and helping to validate or undermine plaintiffs' claims. But few make it a career-long passion like Dr. Egilman has. He taught at Brown University and ran a private practice, but spent most of his time consulting and testifying in as many as 15 cases a year.He did more than just give opinions from the gallery. A tenacious researcher, he dug up incrimina...