Michael Mann, a leading climate scientist, wins his defamation suit

The six-member jury announced its unanimous verdict after a four-week trial in District of Columbia Superior Court and one full day of deliberation. They found both Simberg and Steyn guilty of defaming Mann with multiple false statements and awarded the scientist $1 in compensatory damages from each writer.

The jury also found the writers had made their statements with “maliciousness, spite, ill will, vengeance or deliberate intent to harm,” and levied punitive damages of $1,000 against Simberg and $1 million against Steyn in order to deter others from doing the same.

“This is a victory for science and it’s a victory for scientists,” Mann said.

In 2012, Simberg and Steyn drew parallels between controversy over Mann’s research and the scandal around Jerry Sandusky, the former football coach at Pennsylvania State University who was convicted of sexually assaulting children. Mann was a professor at Penn State at the time.

“It’s constitutionally deliberately hard to win defamation suits in cases involving matters of public concern and prominent public figures,” said RonNell Andersen Jones, a law professor at the University of Utah.

The two sides argued for days about the truth or falsity of the posts, presenting evidence that included unflattering emails between Mann and colleagues, excerpts from investigations by Penn State and the National Science Foundation that cleared Mann of academic misconduct, other scientists who testified that Mann had ruined their reputations, and a detailed but controversial critique of his research methods by a statistician.

Simberg and Steyn testified that they sincerely believed what they wrote.

In statements in court at the beginning and again at the end of the trial, Steyn said he stood “on the truth of every word I wrote about Michael.”

“Inflammatory does not equal defamatory,” Simberg’s attorney, Victoria Weatherford, said in her closing statement. “Rand is just a guy, just a blogger voicing his truly held opinions on a topic that he believes is important. That is an inconvenient truth for Michael Mann.”

Mann argued that he lost grant funding following the blog posts and that he had been excluded from at least one research collaboration because his reputation had suffered. The defendants argued that Mann’s star continued to rise and that he is one of the most successful climate scientists working today.

The presiding judge, Alfred Irving, emphasized to the jury that its job was not to decide whether or not global warming is happening. “I knew that we were walking a fine line from a trial concerning climate change to a trial concerning defamation,” he said earlier while discussing which witnesses to allow.

The story of this lawsuit isn’t over.

In 2021, Irving, along with another D.C. Superior Court judge, decided that the Competitive Enterprise Institute and National Review could not be held liable. The publishers did not meet the bar of “actual malice” imposed on public figures suing for defamation, the judges ruled, meaning employees of the two organizations did not publish Simberg and Steyn’s posts knowing them to be false, nor did they have “reckless disregard” for whether the posts were false.

Mann’s attorneys have indicated that they will appeal this earlier decision. Asked about Competitive Enterprise Institute and National Review, John Williams, who represents Mann, said, “They’re next.”