FILED United States Court of Appeals UNITED STATES COURT OF APPEALS FOR THE TENTH CIRCUIT Tenth Circuit January 14, 2013 PAUL S. RANGEL, Plaintiff-Appellant, SANOFI AVENTIS U.s., LLC; SANOFI AVENTIS U.s., INC., Defendants-Appellees. Elisabeth A. Shumaker Clerk of Court No. 12-3085 (D.C. No. 6:10-CV-01359-CM-KGG) (D. Kan.) ORDER AND JUDGMENT* Before GORSUCH, ANDERSON, and EBEL, Circuit Judges. Paul Rangel appeals from the district court's order granting summary judgment in favor of his former employer on his claims for unlawful age discrimination in violation of the Age Discrimination and Employment Act (ADEA) and ADEA retaliation. What must the plaintiff prove to win the case? What defense can an employer use?