Doctoral Student

Hummy Song

Hummy Song is currently pursuing a PhD in Health Policy Management at the Harvard Graduate School of Arts and Sciences and Harvard Business School. Her research focuses on interdisciplinary coordination, teamwork, and productivity of the health care workforce.

Hummy received an AB in History with a secondary field in Psychology from Harvard College. She holds an MPP from the Harvard Kennedy School of Government, where she focused on global health and development policy. Prior to her master’s program, she worked with the Campaign for Tobacco-Free Kids on international tobacco control policy development and implementation. She also worked as a policy analyst at The Century Foundation.

During and since her master’s program, Hummy has worked with several organizations that are engaged in health care delivery and community health worker programs in the U.S. and in developing countries. She has designed willingness-to-pay studies for global health organizations, and has executed randomized control trials and observational studies in sub-Saharan Africa on health-related topics. Currently, she is working on projects that examine various operational and organizational factors that may affect worker productivity and quality of care.

Hummy Song is currently pursuing a PhD in Health Policy Management at the Harvard Graduate School of Arts and Sciences and Harvard Business School. Her research focuses on interdisciplinary coordination, teamwork, and productivity of the health care workforce.

Hummy received an AB in History with a secondary field in Psychology from Harvard College. She holds an MPP from the Harvard Kennedy School of Government, where she focused on global health and development policy. Prior to her master’s program, she worked with the Campaign for Tobacco-Free Kids on international tobacco control policy development and implementation. She also worked as a policy analyst at The Century Foundation.

During and since her master’s program, Hummy has worked with several organizations that are engaged in health care delivery and community health worker programs in the U.S. and in developing countries. She has designed willingness-to-pay studies for global health organizations, and has executed randomized control trials and observational studies in sub-Saharan Africa on health-related topics. Currently, she is working on projects that examine various operational and organizational factors that may affect worker productivity and quality of care. 

 

Working Papers

  1. The Impact of Pooling on Throughput Time in Discretionary Work Settings: An Empirical Investigation of Emergency Department Length of Stay

    We conduct an empirical investigation on the impact of pooling tasks and resources on throughput times in a discretionary work setting. We use an Emergency Department's (ED) patient-level data (N = 234,334) from 2007 to 2010 to test our hypotheses. We find that when the ED's work system had pooled tasks and resources, patients' lengths of stay were longer than when the ED converted to having dedicated tasks and resources. More specifically, we find that dedicated systems resulted in a 9% overall decrease in length of stay, which corresponds to a 25-minute reduction in length of stay for an average patient of medium severity in this ED. We propose that the improved performance comes from a reduction in social loafing and a more distributed utilization of shared resources. These benefits outweigh the expected efficiency gains from pooling, which are commonly predicted by queuing theory.

    Keywords: pooling; discretionary work; social loafing; shared resources; empirical operations;

    Citation:

    Song, Hummy, Anita L. Tucker, and Karen L. Murrell. "The Impact of Pooling on Throughput Time in Discretionary Work Settings: An Empirical Investigation of Emergency Department Length of Stay." Harvard Business School Working Paper, No. 13–079, March 2013.