Mr. Wallner has litigated complex securities, consumer and antitrust class actions throughout the country.  He currently represents investors in In re Initial Public Offering Securities Litigation (S.D.N.Y) and in lawsuits arising out of the Madoff Ponzi scheme.  He has also represented investors in In re CMS Energy Corporation Securities Litigation (E.D. Mich.) and In re Deutsche Telekom AG Securities Litigation (S.D.N.Y.), and consumers in In re Synthroid Marketing Litigation (N.D. Ill.) and the Mercedes-Benz Tire Litigation (D.N.J.).

Mr. Wallner is a frequent lecturer on securities and complex litigation issues, and serves on the editorial board of Securities Litigation Report, published by West Legalworks.  He served as a member of the Federal Courts Committee of the Association of the Bar of the City of New York, and as a faculty member of the American Bar Association’s First Annual National Institute on Securities Litigation and Arbitration.  He was recently recognized in Lawdragon's "100 Lawyers You Need to Know in Securities Litigation."