The strongest ever professional criticism so far levelled at Michael Mann, a climatologist at Pennsylvania State University, has emerged this week.
A formal investigation into his research conduct found that his treatment of other scientists’ unpublished work was “careless and inappropriate” :-
https://openparachute.files.wordpress.com/2010/07/final_investigation_report.pdf
“The Investigatory Committee considers Dr. Mann’s actions in sharing unpublished manuscripts with third parties, without first having received express consent from the authors of such manuscripts, to be careless and inappropriate. While sharing an unpublished manuscript on the basis of the author’s implied consent may be an acceptable practice in the judgment of some individuals, the Investigatory Committee believes the best practice in this regard is to obtain express consent from the author before sharing an unpublished manuscript with third parties.”