Expert GuidanceThe Consulting Expert vs. The Testifying Expert: What Every Attorney and Expert Needs to Know
There is a moment in almost every complex piece of litigation when an attorney must make a decision that will quietly determine how the entire case develops — before a single deposition has been taken, before a trial date has been set, often before the complaint has even been filed. That decision is whether to bring in an expert, and in what capacity. Most people outside the legal profession think of expert witnesses in a single, monolithic way: a credentialed professional who takes the stand, swears an oath, and explains technical matters to a jury. That image captures only part of the picture. Behind that visible expert — the one who testifies, whose opinions appear in court filings, and whose methodology will be scrutinized under the Daubert standard — there is frequently another expert: one who never testifies, whose work is shielded from opposing counsel, and who plays an entirely different strategic role in the architecture of a case. These are the two categories the law recognizes: the testifying expert and the consulting expert. Understanding the distinction between them — the legal protections each carries, the obligations each creates, and the strategic functions each serves — is essential knowledge for anyone who works in or around litigation. The attorneys, experts, and practitioners who have shared their experiences on the On the Stand with Ashish Arun podcast across three seasons provide a rare, unfiltered window into how this distinction plays out in the real world of litigation practice.