In an action for employment discrimination and retaliation, district court's grant of summary judgment for defendant is affirmed where: 1) plaintiff failed to produce enough evidence to support an inference that defendant's failure to promote was in retaliation for his protected activity; 2) the alterations to plaintiff's job were not materially adverse and insufficient to dissuade a reasonable employee from filing a discrimination charge; and 3) the court properly determined that certain comments made by other employees were either hearsay or irrelevant to the issue of whether plaintiff was terminated for a retaliatory purpose.