Legg (plaintiff) filed a medical-malpractice claim against Dr. Chopra and University Urology, P.C. (the doctors) (defendants) in a diversity action in federal district court in Tennessee. To support the claim, Legg sought to introduce the expert testimony of Dr. Bernard Mittemeyer, who was licensed to practice medicine in Texas. In determining Dr. Mittemeyer was not competent to testify, the court relied on a Tennessee statute that required a medical expert to be licensed in Tennessee or a contiguous border state. The court then granted summary judgment in favor of the doctors, holding that Legg had failed to establish that the doctors had not met the standard of care. Legg appealed, arguing that Dr. Mittemeyer’s testimony was admissible under Federal Rule of Evidence 702.