Want to know why the best experts rarely “win” a case—and why they still matter so much? We sit down with veteran estate and tax attorney and expert witness John Hartog to unpack the real value of expert testimony: confidence backed by facts, credibility that survives cross, and preparation that starts early enough to shape the entire strategy.

John traces his first expert assignment decades ago to what makes testimony persuasive now. We talk about the line between confidence and overconfidence, how an expert adjusts for a judge versus a jury, and why swagger reads as advocacy when a jury is listening. He explains why experts typically don’t decide outcomes—the facts do—but how a disciplined opinion can frame those facts so a fact finder sees them clearly. If you’ve ever waited until the eleventh hour to hire an expert, John spells out the hidden costs, from shaky disclosures to weakened confidence, and makes the case for bringing experts in early to guide discovery, strategy, and settlement leverage.

We go deep on credibility management: handling old articles and books that pop up on cross, distinguishing best practice from the standard of care, and staying consistent without being rigid when new facts or law emerge. John breaks down smart communication under differing discovery rules, especially in states where an expert’s entire file is discoverable. You’ll hear practical tactics—phone-first for substance, tight emails for logistics, screen sharing for drafts—and how federal versus state rules change report strategy. We also compare venues, from California courts to federal cases and even foreign jurisdictions that admit expert opinions on California law, and why local counsel should set guardrails when testifying elsewhere.

Across it all, one theme stands out: productive tension. Lawyers sharpen an expert’s opinion by challenging it; experts strengthen a case by flagging weak facts and untenable theories. That respectful friction is where durable, persuasive testimony is forged. If you work with experts—or are one—this conversation offers a clear roadmap for building opinions that hold up when it counts.

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