Phil Rosemann v. Martin Sigillito

KELLY, Circuit Judge.

Phil Rosemann appeals the district court’s adverse grant of summary judgment in this diversity action alleging legal malpractice against now-disbarred attorney Martin Sigillito. We agree with the district court 1 that in negligence cases like ' this one, Missouri law requires expert-witness testimony about the duty of care owed. Without providing an expert, Rosemann’s claim is invalid. Thus, we affirm the judgment. 2

I. Background

The following facts are construed in the light most favorable to Rosemann, the non-moving party. Quinn v. St. Louis County, 653 F.3d 745, 750…