Heinz Stefan, a giant in water quality modeling and environmental hydraulics

Heinz G. Stefan, Professor Emeritus, Department of Civil, Environmental, and Geo- Engineering, died at the age of 89 on November 4, 2025. He did much of his research and teaching through the St. Anthony Falls Laboratory.

Stefan's impact on the field of hydraulics was widely felt through the early leadership that he demonstrated, through the strength of the research that he performed, and through the number of his students that found important and influential positions throughout the world. Stefan advised, inspired and mentored more than 100 masters and Ph.D. students during his career. He retired from the University in 2011 after a long and illustrious career at UMN.  

Department Head Paige Novak recalls "He was a giant in water quality modeling and environmental hydraulics. I have very fond memories of Heinz; he was a patient and thoughtful mentor to me as a young professor." 

Mihai Marasteanu expressed the thoughts of many when he said, "Heinz was such a great colleague!" 

He will be missed by many for his professional contributions and for his personal impacts on those he worked with, colleagues and students alike.

Read more about Heinz Stefan and his research through the words of his SAFL colleagues.