Dr. Liu is a musculoskeletal epidemiologist with years of clinical practice as a physical therapist. One of Dr. Liu's primary research interests is the application of advanced epidemiological methods using non-experimental data to assess the effectiveness of treatments in real-world settings. Dr. Liu has extensive experience using nationally representative samples with complex, multistage designs and observational data with measurements of patient-reported outcomes and physical activity. Dr. Liu's research focus includes the application of advanced epidemiological and statistical methods to generate knowledge to ultimately improve quality of care for patients with inflammatory arthritis. One of his current projects is to further the understanding of disease trajectories in patients with spondyloarthritis (SpA) by focusing on measurements of patient-reported outcomes and physical function. He is also conducting a study to address the root causes that drive sex- and gender-differences in reporting health quality of life among patients axial SpA.