In legal malpractice litigation, few issues are more important than the credibility of the expert witness. Expert testimony often establishes the applicable standard of care, addresses whether an attorney’s conduct complied with that standard, and, in many cases, shapes the parties’ evaluation of liability long before trial.
Because expert witness testimony plays such a central role, Illinois courts expect complete candor and accuracy throughout the expert disclosure process. A recent Illinois appellate decision, Stoyanov v. Himont Law Group, Ltd., 2024 IL App (1st) 221434-U, illustrates why courts view misconduct involving expert witnesses differently from ordinary discovery disputes.
Although Stoyanov is a Rule 23 order and is generally not precedential, it provides valuable insight into how Illinois courts protect the integrity of the expert witness process in legal malpractice cases.
The Role of the Expert Witness in Legal Malpractice Cases
Unlike many other civil actions, legal malpractice claims almost always require expert testimony. Whether the claim involves litigation strategy, transactional advice, conflicts of interest, missed deadlines, settlement recommendations, or professional judgment, the applicable standard of care is generally outside the knowledge of an ordinary juror.
A qualified legal malpractice expert witness helps the court understand what a reasonably careful attorney would have done under similar circumstances. That analysis must be grounded in the facts of the representation, the governing law, accepted legal practice, and the professional obligations applicable at the time the challenged decisions were made.
The expert witness does not decide the case. Rather, the expert assists the court and the jury in understanding complex legal issues that are beyond the experience of most laypersons. Because of that important role, the credibility of the expert witness is often one of the most significant factors in the outcome of a legal malpractice lawsuit.
The Court’s Decision
In Stoyanov, the plaintiff brought a legal malpractice action against his former attorneys. During discovery, the defendants disclosed multiple purported expert witnesses in support of their defense.
The discovery process, however, revealed significant problems.
According to the opinion, one disclosed expert witness testified that she had never agreed to serve as an expert and had never been contacted regarding the case. Another stated that he did not know he had been disclosed until he received a subpoena. A third indicated that opinions attributed to him were not, in fact, his opinions.
After hearing the testimony, the trial court concluded that portions of the expert witness disclosures had effectively been created “from whole cloth.” The court found that the misconduct was intentional rather than inadvertent.
As a sanction under Illinois Supreme Court Rule 219(c), the circuit court struck the defendants’ pleadings and entered a default judgment on liability.
The Illinois Appellate Court affirmed, recognizing the broad discretion trial courts possess to impose severe sanctions when discovery violations undermine the integrity of the judicial process.
Why This Case Matters
Although Stoyanov is frequently described as a discovery sanctions case, it is perhaps better understood as an opinion about the importance of the expert witness process.
Illinois discovery rules are designed to eliminate surprise and promote the fair resolution of disputes. That objective becomes especially important when expert testimony is involved. Lawyers prepare cases, evaluate settlement, retain rebuttal experts, and formulate trial strategy based upon the opinions disclosed by opposing expert witnesses.
When an expert disclosure does not accurately reflect the identity or opinions of the expert witness, the resulting prejudice extends far beyond an ordinary discovery dispute. It affects the reliability of the litigation process itself.
For that reason, courts frequently distinguish between technical discovery violations and conduct that undermines confidence in the truthfulness of expert witness disclosures. The latter strikes at the integrity of the judicial system and may justify the most severe sanctions available under Illinois law.
Lessons for Lawyers Handling Legal Malpractice Cases
The decision offers several practical lessons for attorneys involved in legal malpractice litigation.
First, the retention of an expert witness should never be assumed. Before identifying an expert in discovery responses, counsel should confirm that the expert witness has agreed to serve, understands the engagement, and has accepted the assignment.
Second, every expert report, expert opinion, and expert disclosure should accurately reflect the conclusions actually reached by the expert witness. The disclosure process is intended to communicate the expert’s opinions—not counsel’s characterization of those opinions.
Third, lawyers should remember that expert witness credibility begins well before trial. The manner in which experts are retained, disclosed, and prepared can significantly influence how courts evaluate both the opinions themselves and the conduct of counsel.
Finally, legal malpractice litigation presents unique challenges because attorneys themselves are the subject of the professional negligence claims. That reality makes objective, well-supported expert testimony particularly important. Courts rely upon experienced legal malpractice expert witnesses to explain the applicable professional standard of care without becoming advocates for either side.
Beyond Discovery: Protecting the Integrity of the Judicial Process
One of the most significant aspects of Stoyanov is the court’s recognition that expert witness misconduct is fundamentally different from many other discovery disputes.
The judicial system depends upon the integrity of expert testimony. Judges rely on expert witnesses when deciding dispositive motions. Juries frequently depend upon expert opinions to understand professional standards that lie outside ordinary experience. Attorneys rely upon opposing expert disclosures when preparing depositions, evaluating settlement, and developing trial strategy.
When those disclosures cannot be trusted, the fairness of the litigation process is placed at risk.
For that reason, Stoyanov serves as an important reminder that compliance with Illinois discovery rules is not merely procedural. It is essential to preserving confidence in the judicial system and ensuring that legal malpractice cases are decided on reliable evidence rather than misleading expert witness disclosures.
Conclusion
Although Stoyanov is a nonprecedential Rule 23 order, it offers meaningful guidance for lawyers handling legal malpractice cases and other professional negligence litigation. The decision reinforces a principle that extends well beyond discovery: the credibility of the expert witnessprocess is indispensable to the fair administration of justice.
For attorneys litigating legal malpractice claims, careful selection of a qualified legal malpractice expert witness, accurate expert disclosures, and objective expert testimony are not simply best practices—they are fundamental to maintaining the integrity of the litigation process.
As Illinois courts continue to address issues involving expert witnesses, attorney negligence, the standard of care, and professional responsibility, decisions like Stoyanov provide valuable guidance for lawyers seeking to navigate increasingly complex legal malpractice litigation.
