Dr. Bill Retzlaff
Distinguished Research Professor/Associate Provost for Strategic Academic Initiatives
Ph.D. Clemson University, 1987
Office: RH 3109
Research Lab: SW 2235
Phone: (618) 444-1959
E-mail: wretzla@siue.edu
Research Interests: Dr. Retzlaff is currently the research co-director of the St. Louis metropolitan area research collaboration (G.R.E.E.N. – Green Roof Environmental Evaluation Network) based at Southern Illinois University Edwardsville (SIUE). His main areas of research interest include: evaluation of green roof and green wall technologies, sustainable green infrastructure, and sustainable use of residual waste products.
Selected Publications
Ostendorf M, Morgan S, Retzlaff W, Celik S. 2025. Evaluating plant coverage and thermal benefits of green walls for sustainable design. Journal of Ecological Engineering Design. https://doi.org/10.70793/jeed.21
Ashitey, P., R. Benjankar, S. Morgan, B. Retzlaff, and S. Celik. 2023. Analysis of the effectiveness of different media depths and plant treatments on green roof rainfall retention capability under various rainfall patterns. Hydrology, 10, 149, 13 pp.
Ostendorf, M., Morgan, S., Celik, S., Retzlaff, B., 2021, “Evaluating the stormwater retention of a living retaining wall system”, JLIV 8:1-
Bousselot, J., V. Russell, L. Tolderlund, S. Celik, B. Retzlaff, S. Morgan, I. Buffam, R. Coffman, J. Williams, M. Mitchell, J. Backer, and J. DeSpain. 2020. Green roof research in North America: A recent history and future strategies. JLIV 7:27-64
Celik, S., D. Murphy, S. Morgan, and B. Retzlaff. 2019. Thermal heat flux evaluation of sloped green roofs and shingle roofs. JLIV 6:15-30
Murphy, D., S. Morgan, S. Celik, and W. Retzlaff. 2018. Evaluation of a residential green roof system for storm water runoff retention. JLIV 5:16-30
