AEESP Mourns the Passing of Dr. Dionysios Dionysiou

December 1, 2023

Dion DionysiouDear members,

The AEESP community mourns the passing of longtime member Dr. Dionysios (Dion) Dionysiou on Nov. 20, 2023.  Dion was a Professor in the Department of Civil and Environmental Engineering at the University of Cincinnati.

Originally from Paphos, Cyprus, Dion earned his undergraduate degree in Chemical Engineering from National Technical University of Athens, Greece in 1991, followed by a Master’s in Chemical Engineering from Tufts University in 1995, and his Ph.D. in Environmental Engineering from the University of Cincinnati in 2001, where he remained throughout his career.

His long list of accomplishments include co-authoring over 630 journal articles, delivering over 600 presentations in over 50 countries, and teaching over 30 different courses in engineering. While Dion was a prolific researcher and teacher in the field of environmental engineering and science, he was also widely known and respected for his kindness and commitment to elevating members of our community. Many AEESP members have remarked on Dion’s personal impact on their professional journeys: We encourage you to share your stories and interactions with Dion.

Dion joined AEESP in 2001.  He was an active member who served on the Board of Directors (2014-2017), as Chief Technology Officer (2015-2017), on the AEESP Lecturers Committee (2023), and as the AEESP Liaison to the Environmental Chemistry Division of the American Chemical Society (ACS). Dion received the 2014 ARCADIS / AEESP Frontier in Research Award (now Walter J. Weber, Jr. AEESP Frontier in Research Award), 2017 AEESP Distinguished Service Award for serving on the Board of Directors and Chief Technology Officer, and 2021 Outstanding Publication Award. He was also the advisor to the 2008 CH2M Hill (now Jacobs Engineering Group) Outstanding Doctoral Dissertation Award Recipient. For his professional accomplishments and contributions to AEESP, he was inducted as an AEESP Fellow in 2018. Dion also provided exemplary service to our field through his leadership roles in the ACS Division of Environmental Chemistry, where he worked to support early-career, female, and international faculty.

Dion’s legacy will live on through the work of his many current and former students who have gone on to pursue careers in environmental engineering and science.  We will miss Dion’s contributions to AEESP and send our deepest sympathies to his family, students, and colleagues at the University of Cincinnati.

For more about the life and legacy of Dion, please click here:

In lieu of flowers, please consider donating to UC Foundation, Attn: Professor Dion Dionysiou Memorial Fund, P.O. Box 19970, Cincinnati, OH 45219-0970.  Please note the gift is in memory of Dr. Dionysiou or your charity of choice.

Dion’s obituary page:


Debora F. Rodrigues (President) and Lee Blaney (President-elect) on behalf of the AEESP Board of Directors