Mann sued Tim Ball and the Frontier Centre for libel. From Forbes 2012, where Larry Bell predicted the wrong outcome:
The first law suit was filed against Canadian climate scientist Timothy Ball who humorously commented in an interview published by the Frontier Center for Public Policy, a Winnipeg think tank, that Penn State researcher Mann should, instead, be in the state pen.Mann says he has not settled his claims against Tim Ball, who remains a defendant in the lawsuit. We'll see about that "humor."
Tim Ball's scientific reputation has already been shredded in a Canadian court, as it's been admitted in a court of law that he is not a climate science expert.
After the Calgary Herald published an op-ed by Ball on April 19, 2006, whom the newspaper identified as the first climatology PhD in Canada and a climatology professor at the University of Winnipeg for 28 years, they published a letter on April 23, 2006 from Dr. Dan Johnson, a professor at the University of Lethbridge, who pointed out that neither of those descriptions is true; that Dr. Ball's credentials were being seriously overstated. Ball later threatened Johnson and the Herald and ultimately sued for defamation.
In their Statement of Defense filed in Court, the Calgary Herald submitted the following:
1. "...that the Plaintiff (Ball) never held a reputation in the scientific community as a noted climatologist and authority on global warming.
2. "The Plaintiff has never published any research in any peer-reviewed scientific journal which addressed the topic of human contributions to greenhouse gas emissions and global warming
3. "The Plaintiff has published no papers on climatology in academically recognized peer-reviewed scientific journals since his retirement as a Professor in 1996;
4. "The Plaintiff's credentials and credibility as an expert on the issue of global warming have been repeatedly disparaged in the media; and
5. "The Plaintiff is viewed as a paid promoter of the agenda of the oil and gas industry rather than as a practicing scientist."
Ball dropped his lawsuit.....
Source: The Calgary Herald, Statement of Defense – paragraph 50, Dr Tim Ball v The Calgary Herald, In the Court of the Queen’s Bench of Alberta Judicial District of Calgary, Dec 7, 2006 (http://is.gd/brO4uO).