Our Litigator of the Week is Paul, Weiss, Rifkind, Wharton & Garrison’s Lewis Clayton for his win on behalf of Fresenius SE & Co. in a seminal M&A case before the Delaware Supreme Court.

On Dec. 7, the court upheld Clayton’s lower court victory, when he convinced Vice Chancellor Travis Laster in October to let Fresenius walk away from its agreement to buy Akorn Inc. The reason? The court found Akorn suffered a material adverse change in its business—the first time a Delaware court has ever made such a finding.