This case study examined the current assessment practices in the math school of a large research university in the United States. After reviewing a sample of course syllabi offered in the spring 2021 semester, we descriptively summarized the use of 19 assessment methods in the school and examined the assessment patterns by subjects, class standings, and class size. Our study found that traditional homework and written tests were the most frequently used assessments in the school, while the use of learner-centered assessments was rare. Among the 19 assessment methods, we found significantly different usage of quizzes, participation scores, and projects by various course characteristics. Our case study demonstrates the gap between the recommended and actual assessment practice in U.S. higher education. We call for more future research that explores strategies to effect changes and increase the use of learner-centered assessment in higher education institutions.